I bought a 7060 used a few years ago with just under 300 hours. Now at 600.
it regens as the manual says. The light comes on, if you can’t remember what to do, there’s instructions on the sun visor (if it’s a cab!). You simply raise the RPM till the light stops flashing and it will start it’s cycle. Keep working. Or ignore it and do a parked regen later. (Park, raise rpm, push button, walk away). Takes less than 10 minutes. It’s not a big deal. Yes it’s more annoying than a non dpf machine. I deleted my VW because of the unreliable system. If this machine requires repair out of warranty, it will be deleted as well.
It will regen more often if left idling long periods, especially during the winter. (Think warm ups). Or lots of low rpm light duty work. I’m on the road at WOT a lot pulling a trailer so it’s working and I bet I average a regen every 50-75hrs.
Finding a few year older low hour non DPF machine is likely harder. However, I don’t think this system (from my few years of using) is unreliable (compared to the VW, and hearing friends with dodge trucks complain)
I’d be more concerned with all the other little things with a low use machine like all the hoses and belts, water in fluids, seized controls (3pt lowering control, draft linkages etc), rubber boots.... was it in a shed or in the sun?