I just upgraded to the Mackissic 12PHT8HMC, so I no longer have a use for it. I've used it for about 6 years. It's in "fair" condition. The screen blew a hole, and I temporarily mended it, but there's no telling how long that will last. I've been told by a former Mackissic dealer that the Mackissic Mighty Mac screen will fit the Grizzly. Whether that's true or not, I cannot confirm.
The motor is a briggs & straton 6.5 industrial commercial. I upgraded the clutch from the stock clutch to an industrial clutch that has lasted several years. I replaced the carb a year or so ago. I also replaced one of the bearings (I still have spare bearings that I will give you.)
I don't know how much life it has left, but it fires up every time, and the motor is probably worth at least my asking price. If you're mechanically inclined and /or have a welder friend, you could probably keep this thing running for many years to come.
Retail price is $800. My asking price is $150. The manufacturer has stopped selling it, but this is the one:
http://www.grizzly.com/outlet/Large-Chipper-Shredder-w-Briggs-Stratton-/G0594The machine is a nice combo of ease, power, and safety. I've put my hand a little too deep into the shredder hopper a couple of times and walked away with nothing more than a sore finger. When I did that on the Mackissic, it tore a big chunk out of my finger and tore my leather gloves to shreds. Needless to say, I'll never be doing that again... :-/ The chipper end is also too slim to fit an arm down, so it's what I consider very safe (unlike the mackissic -- an entire arm could go in there, I won't be wearing loose clothing around that monster).