The dogs love it.  I had some concerns because of the bottom being held in by velcro, but even my rambunctious dachshunds haven't dislodged or torn it up.  Only other concern I had was whether or not my more anxious dog would actually go into the dog pen if the mesh door was unzippered but not secured out of the way.  Not a problem, he zips in and out and thinks its a neat way to "hide" when pushing my ball outside the pen as an invite to play.