If you search through the SpeedPro thread, you will see nothing but problems. There were 2 good things about them... They helped introduce me to splitting with a flywheel/kinetic splitter (everything else seems to be in slow motion). The only other good thing about the speedpro was that I got a full refund even after a full year of ownership. You will have to read the speedpro thread for all the woes.
If you search through the DR Rapidfire thread, you will see a lot of happy home owners. But it seems that the commercial owners who split major quantities (50+ cord/year) are having some issues. Downtime sucks when it costs you money. I will say it seems that DR customer service is repairing the machines, but I have to question if it's not a design flaw. I do not own a DR and thank you to the guys posting in there thread for reporting there woes.
If you search through ArboristSite threads for a SuperSplit, as I have for almost a year now, well... I can't find any complaints!
I did own a Speedpro. It would split everything I through at it, really fast. BUT, it would also self-destruct in a short amount of time. I was alot more excited the day I returned it than I was on the day I bought it...that was also the same day I ordered my SS!!!
Now I own a SuperSplit J model. I love it. The quality parts and workmanship are obvious. Just ran some Hickory and some White Oak through it. I had one knotted piece that I had to hit twice in a truckload. I used to hate splitting white oak because it is so stringy. Took forever with a hydro because you had to run the wedge through a full cycle because of the stringyness. Now I have to double check that it is white oak because with the SS it splits like Ash.
Just my $.02 worth... hope it helps.
+1 for the SS