We have owned a 2010 KZ Spree 240BHS LX since 2011. Have taken it to Yellowstone (from NC) and a bunch of other closer destinations since we got it. We are the second owner, first owner used it two times before selling to us (he couldn't keep up the payments).
The only issue I have encountered with it was the brake wiring, the run inside the axle wore out and shorted so I rewired the entire brake system and it's been fine since.
Other than the above issue, no problems at all. I've made several improvements, the most notable was replacing all the plastic drawer slides with metal locking slides and now when we travel and open the camper up at the end of the day, the drawers are all still closed!
IMO, the construction of our unit was above average and I feel that there are many more trouble free years of use left in the unit.