We checked out Hop-A-Lot in West Des Moines for the first time today.  It's across from Valley West Mall and was formerly located in Merle Hay Mall.  My kids liked the variety of inflatables, but overall it wasn't a good experience. 

We arrived just after they opened, yet everything was dirty (sticky tables, overflowing trash).  Due to the setup of the inflatables, it's hard for parents to keep an eye on their kids.  I prefer the setup at Pump It Up, which has one open area in between the inflatables.