If it's one of the models with the Lippert frame that is made by welding 3 pieces of sheet steel together to form an I-beam, I'd look for something else. These frames are very weak and flex a lot and can cause serious problems.
Our KZ dealer has refused to honor the 2nd year of the 2 year factory warranty because I've done some modifications. Just an excuse as it in no way contravenes the written factory warranty. Not impressed with our dealer for other reasons too. I'd try and find out what the dealer is like before buying.
Other than the frame, I'd say overall our KZ Spree is above average. Doesn't mean it's acceptable IMO though, as on average quality in TTs is lacking. I've found some things, like wiring for ex. are not done well. (I'm an EE so have a good idea what is good and what isn't)
Would we buy another? After what we've been through, nope. Especially since they're now owned by Thor. Friends of ours have a Keystone TT and I'm shocked by some of the poor workmanship and inherent design. Only time will tell if Thor does the same thing with KZ.