We have an '02 325, bought from the original owners when it was 8 years old. Our only problems have been water ingress into the dinette slide out (fortunately limited to wet cabinet interiors) and a non-functional Onan generator.
Once I got "under the skin", I was unimpressed by the quality of the cabinetry and electrical wiring. Rather than an installation of pre-assembled furniture and wiring harness, it looked like the guys on the shop floor had put it together inside the shell with whatever was handy.
The generator problem is the result of cardiac problems that made it impossible to do the monthly exercise during periods of non use. It sat for 4 months, and hasn't run again since. Not a big deal for us, since we're FHU campers, but I'll have to get it fixed before we sell the rig.
Other than these, no problems. Ride quality is like an 11-ton box truck, primarily because that's what is really is. For 5000 miles a year, we can live with it.
Frank Damp, DW - Eileen, pet - female Labrador (10 yrs old), location Anacortes, WA, retired RVers (since Dec 2014)