I'm not. While any mechanical device is bound to have gremlins, the biggest problem with Tier 4 is that people are afraid of trying new things.I would like to know more about regen issues...
I really was surprised on how few complaints about Tier 4 there were
40 years ago many people-including me- were afraid of things like electronic ignition and computers in cars. Yet having owned cars from that era; I would not want to go back to a carbureted car and point ignitions in my daily driver. Heck, spark plugs routinely last longer now than engines did.
I put about 250 hours a year on my 3301. Then I go down to the family homestead and use my father's L2800- which is a very nice tractor to run- and the first thing that I notice is the diesel smell. Some people enjoy that; I don't.