We don't have a membership here, but my son has been invited to many birthday parties here. I have always been impressed with the way the parties are handled - there are lots of activities for the kids to do centered around the birthday party - running, jumping, singing, dancing, etc.
I was particularly impressed with the young adults who worked the parties - they really seemed to enjoy interacting with the children and the children were really well behaved because of this.
The parties are on the expensive side, but I believe you get a discount if you have a membership. With your membership you have access to a wide variety of classes suited to the age of your child - focusing on developing their strength, flexibility and motor skills.
I wish they had set up shop in another section of Cranberry - the entrance to the gym is around a sharp corner and there is a Starbucks drive-thru right there and I think it is only a matter of time before a serious accident occurs.