We've had our '09 KZ Inferno 3905 for over 3 years and overall it's been great. It's very similar to the pic in "turner66" sig but one foot shorter with two less slideouts. My wife liked his model best but, our 3905 had the highest cargo weight capacity which we fill with a sandrail and quads with the 17+ foot to the first cabinet cargo area. Structurally it's been great and the fit and finish has been pretty solid. I did opt to do an axle flip to bring it level with my 4x4 tow vehicle and it was the best money I've spent on the hauler. I had to fix stupid things like the window valances separating because they were joined with air nails and other very minor things that didn't require warranty work. The absolute worst part of my Inferno are the completely lame cargo floor rings. They are so substandard compared to the rest of the build it blows my mind. I also upgraded from the factory China bombs to Michelin Ribs - $$$$ but worth the peace of mind.
Good luck with your decision.