We are on our second Nexus. First was a 23P and we put 37,000 miles on it. Only real problem was refrig. mother board died. I put the 5 star tuning on it to help the quick shifts. I put extra leaf springs on it to level the loaded coach along with air bags on the rear and we drove it all over Alaska. We spent 5 solid months in that rig and were pleased with the overall quality and performance.
We recently traded the 23p in and now have a 28P. I put 1 1/2 inch spacer blocks on rear axle to lift it a little and now have very little drag. Does not seem to need the 5 star tuning or heavier springs.
We really like the 28P. Plenty of room and an easy bed to get in and out. I have had not one thing wrong with the 28p. We had the couch replaced with two recliners and I moved the TV to the other side and added some custom drawers in the galley. I put a cherry 4 inch wall around the overhead bunk and we use that for storage with plastic bins. I built more shelves in the over main bed storage and put a cherry step and box for my wife to use to get into the bed without jumping
If the handling does not please you there are some things to do with sway bars and the like that can make it more stable. MIne seems to behave ok but none of these is going to handle like my now gone Z3
