diff --git a/modules/scalacheck/src/weaver/scalacheck/CheckConfig.scala b/modules/scalacheck/src/weaver/scalacheck/CheckConfig.scala
index 78c05283..3be56e4a 100644
--- a/modules/scalacheck/src/weaver/scalacheck/CheckConfig.scala
+++ b/modules/scalacheck/src/weaver/scalacheck/CheckConfig.scala
@@ -3,68 +3,121 @@ package scalacheck
 
 import org.scalacheck.rng.Seed
 
-sealed abstract class CheckConfig private { outer =>
+final class CheckConfig(
+    val minimumSuccessful: Int,
+    val maximumDiscardRatio: Int,
+    val maximumGeneratorSize: Int,
+    val perPropertyParallelism: Int,
+    val initialSeed: Option[Seed]) extends Product with Serializable {
+  assert(maximumDiscardRatio >= 0)
+  assert(maximumDiscardRatio <= 100)
+  assert(minimumSuccessful > 0)
 
-  val minimumSuccessful: Int
-  def withMinimumSuccessful(minimumSuccessful: Int): CheckConfig =
-    cpy(minimumSuccessful0 = minimumSuccessful)
+  def maximumDiscarded = minimumSuccessful * maximumDiscardRatio / 100
 
-  val maximumDiscardRatio: Int
-  def withMaximumDiscardRatio(maximumDiscardRatio: Int): CheckConfig =
-    cpy(maximumDiscardRatio0 = maximumDiscardRatio)
+  def withMinimumSuccessful(minimumSuccessful: Int) = new CheckConfig(
+    minimumSuccessful = minimumSuccessful,
+    maximumDiscardRatio = this.maximumDiscardRatio,
+    maximumGeneratorSize = this.maximumGeneratorSize,
+    perPropertyParallelism = this.perPropertyParallelism,
+    initialSeed = this.initialSeed
+  )
 
-  val maximumGeneratorSize: Int
-  def withMaximumGeneratorSize(maximumGeneratorSize: Int): CheckConfig =
-    cpy(maximumGeneratorSize0 = maximumGeneratorSize)
+  def withMaximumDiscardRatio(maximumDiscardRatio: Int) = new CheckConfig(
+    minimumSuccessful = this.minimumSuccessful,
+    maximumDiscardRatio = maximumDiscardRatio,
+    maximumGeneratorSize = this.maximumGeneratorSize,
+    perPropertyParallelism = this.perPropertyParallelism,
+    initialSeed = this.initialSeed
+  )
 
-  val perPropertyParallelism: Int
-  def withPerPropertyParallelism(perPropertyParallelism: Int): CheckConfig =
-    cpy(perPropertyParallelism0 = perPropertyParallelism)
+  def withMaximumGeneratorSize(maximumGeneratorSize: Int) = new CheckConfig(
+    minimumSuccessful = this.minimumSuccessful,
+    maximumDiscardRatio = this.maximumDiscardRatio,
+    maximumGeneratorSize = maximumGeneratorSize,
+    perPropertyParallelism = this.perPropertyParallelism,
+    initialSeed = this.initialSeed
+  )
 
-  val initialSeed: Option[Seed]
-  def withInitialSeed(initialSeed: Option[Seed]): CheckConfig =
-    cpy(initialSeed0 = initialSeed)
+  def withPerPropertyParallelism(perPropertyParallelism: Int) = new CheckConfig(
+    minimumSuccessful = this.minimumSuccessful,
+    maximumDiscardRatio = this.maximumDiscardRatio,
+    maximumGeneratorSize = this.maximumGeneratorSize,
+    perPropertyParallelism = perPropertyParallelism,
+    initialSeed = this.initialSeed
+  )
 
-  def maximumDiscarded = minimumSuccessful * maximumDiscardRatio / 100
+  def withInitialSeed(initialSeed: Option[Seed]) = new CheckConfig(
+    minimumSuccessful = this.minimumSuccessful,
+    maximumDiscardRatio = this.maximumDiscardRatio,
+    maximumGeneratorSize = this.maximumGeneratorSize,
+    perPropertyParallelism = this.perPropertyParallelism,
+    initialSeed = initialSeed
+  )
 
-  private[this] def cpy(
-      minimumSuccessful0: Int = outer.minimumSuccessful,
-      maximumDiscardRatio0: Int = outer.maximumDiscardRatio,
-      maximumGeneratorSize0: Int = outer.maximumGeneratorSize,
-      perPropertyParallelism0: Int = outer.perPropertyParallelism,
-      initialSeed0: Option[Seed] = outer.initialSeed): CheckConfig =
-    new CheckConfig {
-      val minimumSuccessful: Int      = minimumSuccessful0
-      val maximumDiscardRatio: Int    = maximumDiscardRatio0
-      val maximumGeneratorSize: Int   = maximumGeneratorSize0
-      val perPropertyParallelism: Int = perPropertyParallelism0
-      val initialSeed: Option[Seed]   = initialSeed0
-    }
-}
+  override def toString: String = {
+    val b = new StringBuilder("CheckConfig(")
+    b.append(String.valueOf(this.minimumSuccessful))
+    b.append(", ")
+    b.append(String.valueOf(this.maximumDiscardRatio))
+    b.append(", ")
+    b.append(String.valueOf(this.maximumGeneratorSize))
+    b.append(", ")
+    b.append(String.valueOf(this.perPropertyParallelism))
+    b.append(", ")
+    b.append(String.valueOf(this.initialSeed))
+    b.append(")")
+    b.toString()
+  }
 
-object CheckConfig {
-  val default: CheckConfig = new CheckConfig {
-    val minimumSuccessful      = 80
-    val maximumDiscardRatio    = 5
-    val maximumGeneratorSize   = 100
-    val perPropertyParallelism = 10
-    val initialSeed            = None
+  override def canEqual(obj: Any): Boolean =
+    obj != null && obj.isInstanceOf[CheckConfig]
+
+  override def equals(obj: Any): Boolean = canEqual(obj) && {
+    val other = obj.asInstanceOf[CheckConfig]
+    this.minimumSuccessful == other.minimumSuccessful && this.maximumDiscardRatio == other.maximumDiscardRatio && this.maximumGeneratorSize == other.maximumGeneratorSize &&
+    this.perPropertyParallelism == other.perPropertyParallelism && this.initialSeed == other.initialSeed
   }
 
-  def apply(
-      minimumSuccessful0: Int,
-      maximumDiscardRatio0: Int,
-      maximumGeneratorSize0: Int,
-      perPropertyParallelism0: Int,
-      initialSeed0: Option[Seed]): CheckConfig = new CheckConfig {
-    assert(maximumDiscardRatio0 >= 0)
-    assert(maximumDiscardRatio0 <= 100)
-    assert(minimumSuccessful0 > 0)
-    val minimumSuccessful      = minimumSuccessful0
-    val maximumDiscardRatio    = maximumDiscardRatio0
-    val maximumGeneratorSize   = maximumGeneratorSize0
-    val perPropertyParallelism = perPropertyParallelism0
-    val initialSeed            = initialSeed0
+  override def hashCode: Int = {
+    var code = 17 + "CheckConfig".##
+    code = 37 * code + this.minimumSuccessful.##
+    code = 37 * code + this.maximumDiscardRatio.##
+    code = 37 * code + this.maximumGeneratorSize.##
+    code = 37 * code + this.perPropertyParallelism.##
+    code = 37 * code + this.initialSeed.##
+    37 * code
   }
 
+  override def productPrefix: String = "CheckConfig"
+
+  override def productArity: Int = 5
+
+  override def productElement(n: Int): Any = n match {
+    case 0 => this.minimumSuccessful
+    case 1 => this.maximumDiscardRatio
+    case 2 => this.maximumGeneratorSize
+    case 3 => this.perPropertyParallelism
+    case 4 => this.initialSeed
+    case n => throw new IndexOutOfBoundsException(n.toString)
+  }
+}
+
+object CheckConfig {
+  def default: CheckConfig = CheckConfig(minimumSuccessful = 80,
+                                         maximumDiscardRatio = 5,
+                                         maximumGeneratorSize = 100,
+                                         perPropertyParallelism = 10,
+                                         initialSeed = None)
+  def apply(
+      minimumSuccessful: Int,
+      maximumDiscardRatio: Int,
+      maximumGeneratorSize: Int,
+      perPropertyParallelism: Int,
+      initialSeed: Option[Seed]): CheckConfig =
+    new CheckConfig(minimumSuccessful,
+                    maximumDiscardRatio,
+                    maximumGeneratorSize,
+                    perPropertyParallelism,
+                    initialSeed)
 }