I own a 12" Carlton with the 88hp Kubota diesel engine and the winch. Model #1712.
I have just over 100 hours on it. Those first hundred hours have been good. I had minor bugs to work out from the start, but hours 60-100 i can say I didn't call James (James Patrick, are you sure he's the owner, EZ?) at all.
The bugs I dealt with were minor enough I won't go into detail, and customer support has always been great.
If you are into chipping 12" hickory, you may want a larger chipper. If you want to throw some 12" white pine through there, no problem. I do a lot of white pine removals (go figure, Western North Carolinians don't like white pines all that much), so it's the perfect chipper for me 75% of the time.
The other 25% of the time, I give it away as firewood or grapple and load the stuff with the branch manager.
My other 40 hours of the week are spent with a Bandit 1590 with 1500 hours on it. These two chippers aren't in the same league, but I can tell already that the "details" people speak of on the Carlton pay off in the long run. Thicker steel for instance in a lot of key places. Welds that have broken several times on the Bandit now in the 6 years we've been running this chipper.
Oh and price. Comparable chippers were several thousand dollars different. That was important to me, still is, especially if they are similar products. They are.