DPFs CAN be cleaned at least once. No idea on what that costs.
My understanding is that DPFs are warrantied for a pretty long time (I believe it's 3,000 hrs).
EGR problems? I have an EGR valve in my Kioti: only 675 hrs, so no idea on its long-term usability. Also have them in my MKIV VW TDIs, and while I've had to clean them on every car that I've acquired (sans one in which it came from a fellow TDI enthusiast who knows how to take care of these cars/engines), I have not had to touch them afterwards because I operate the cars/engines as they should be operated: long runs at operating temperatures. EGR valves have been around for quite some time; if some tractor manufacturer is having problems with them, and it's not the operator who is at fault, then that manufacturer flat out dropped the ball.
Only two of my Kioti's regens have been parked ones. Just had one the other day as I was finishing up with something and was in the midst of contemplating mowing another smaller area so I decided to go ahead and do that work asa the regen ran. I'll grant that if one is in a hurry to to wrap something up and hits a regen that that kind of sucks, but figure it more like running into a traffic jam when you weren't expecting it: sometimes things just happen when you're not really wanting them to happen (but it's not like folks WANT a regen to happen, unless, that is, one is overdue and is a bit concerned whether the system is properly monitoring itself).
