As far as I know its extremely difficult to overdose on dechlorinator. I have never heard of anyone doing this.
I have used stresscoat and it seems to work well. I switched to a different brand because I have a lot of tanks and wanted something that treats more gallons. But with most small tanks it is a great product. Basically any normal dechlorinator works well though. Stresscoat is basically the same as Tetra Aquasafe, or Start Right or Wardleys version or anyother basic dechlorinator.