We used this place for an hour recently. Cost was affordable, I think that it ended up being 22 and change for two children for an hour (including 5% discount for having the player card).
Love love LOVE the fact that your child can't attend if they don't have their immunization records on file.
My two kids both came out smiling and said they really enjoyed it. And my husband and I enjoyed it just for the sheer security of the whole operation. Closed, heavy doors in order to gain entrance. An additional two doors that the children have to go through to gain entrance to the floor (or exit, for that matter). A security bar code for each child and an accompanying one for the adult. You don't have the bar code? You aren't getting your kid out. ;)
Thanks, Kids Quest, for that much needed time.