I have a 31 ton MTD with an 8 hp Briggs industrial / commercial motor & 5" piston. I got it from CL in Oct '06 for 1200. It was very slightly used, maybe had 10 hrs on it and less than 5 gal of fuel run through it. Dude had a couple of big trees dropped, used it on them and had it stored in his garage for 2 years. I believe he paid 1700 for it new.
I used to only burn about 2 cord per year and always limited myself to 12" diameter "easy to maul" non-knotty stuff. Now with the splitter it has been more like 3 to 4+ cord per year. Knotted hardwoods (mostly oak) up to 20+" diameter and 20" long are fun to crack open. I have yet to find a round this thing won't split. It will take up to 24" long rounds.
Mice built a nest inside the blower housing one winter & chewed up the ground wire for the ignition coil. I guess I shouldn't have left it sitting under a tarp next to the wood pile. The 13-14 winter was cold with a decent amount of snow, and the mice living under the wood pile under the deck chewed holes in the corners of the plastic fuel tank. They also built a nest in the tongue. This spring I put new fuel lines on it. I drain the fuel tank and run it dry for long term storage.
Cycle time is plenty fast enough for me at full throttle. I actually lowered the throttle setting to about 3/4 just to reduce noise & fuel consumption a bit. It still splits everything I throw at it. After I split and build some corner stacks, I run the MTD and my other half fills in the middle of the stacks.
Mine had little "log cradle" things on each side of the beam. I added 12 x 12 pieces of 1/4" plate to make them MUCH more effective. When splitting big heavy stuff right off the truck or trailer, I remove one wing and bolt on a 4' long 2x10 "feed ramp".