I have an 02 Montana 3280RL. In the 3+ years I've owned it I've had to: Repair hydraulics, upgrade the suspension, new brakes, flat screen upgrade, install new unit in refrig, re-caulk exterior, coat roof, new grey and black tanks, and new decals.
Currently between trips, so I'm replacing refrig gaskets and trying to repair oven thermostat.
The rig already had an Onan generator, I've also done a bunch of upgrades: 200 watt solar, 1200 watt inverter, Winegard Trav'ler, four 6 volt batteries, Seelevel gauge, Dometic 310 toilet.
It takes a lot to keep these rigs on the road. Fortunate that I've been able to do all of the work myself, so my cost is the parts and wrecking my body. It's good as new, I keep it that way.
We much prefer our layout to anything new that we've seen.
'05 F250 6.0 Bullet Proofed
'02 Montana 3280RL Upgraded a bunch.