I purchased my B3350 Kubota (DPF) in Nov. '13, an early one. I have had no problems, but the DPF is a nuisance to live with, especially when it comes to engine management as you are supposed to limit idling and operate at higher rpm (even though the job wouldn't otherwise need higher rpm). The turbo means you have to wait at idle for a bit, at least 30 seconds, before shut down so the oil doesn't coke in the turbo bearings. So when you need to get off for a minute you are faced with either leaving the engine running fast, waiting the 30 seconds before doing a shutdown (they should have included an auto turbo cool-down delay), or leaving it idling and loading up the DPF. For small equipment like CUTs, I think the EPA regs are just way overboard.
My tractor is now at the shop getting the emissions updates done. Figured I better get it overwith before winter when I'll be needing if for snow. I miss my tractor, is that weird or what?