K.M.
Have been to several b-day parties there and had my daughter's 5th b-day party there in May. The hostess was great with the kids! I highly recommend it.
Our church meets at Hero's, and has Bible Blitz for the kids there on Wednesday nights. The owners are great people and have always been very friendly (they do not attend our church).
I'm not saying nobody ever gets hurt, but nobody has been hurt at any of the parties we have been to. Any injuries I have seen during Bible Blitz have been minor and occurred when the bigger kids (9-10 year olds) were rough housing too much and not obeying the rules and either hurt each other or ran into the smaller kids.
Good luck!
K.