Late answer to an old thread, but had to share my experience today. Sounds like things have gone WAAAAY downhill in the last couple of years.
Do NOT go to ASI Gymnastics in Allen for a birthday party if your children are under 5. The activities planned were boring for 3/4 year olds. Any attempts to have 'free-play' outside of the structured part were met with employees yelling at the KIDS ... not the parents who were standing right next to them .. yelling at the kids...
4 other sets of parents were livid after the party today. We couldn't even try to play with our children in the main area as 'parents were not allowed'. After repeated run-ins with multiple parents, we asked to speak to a manager and conveniently, there wasn't one on duty. We were told 'we don't make up the rules' so many times it was just unreal. My 3 year old daughter was in tears multiple times as were several other children (some as old as 5 and 6)...
At Metroplex Gym or even Eagles Wings, the kids actually get to have some fun and explore along with their parents (so the shy kids aren't left out). I would highly recommend any place other than ASI in Allen. I will never be back for any reason ..