Report: The Powerhorse 4x24 splits very well. The speed is not outstanding, as predicted by others, with my tractor hydraulics (8.5 gpm). But the power is unstoppable so far. What I had on hand to test it was 12-14 inch Elm, which most of you know is a stringy mess to split. I assumed that the P.horse would split better in "extend" than in "retract" due to the rod area. It goes noticably faster in retract, but still splits the elm without slowing. I have not tried wet oak yet. The speed with tractor at pto speed is about 13 seconds extend, 11 retract. I timed some other tractor rpm settings too, but left the numbers in the shop. As re-built, it quick hitches onto the Speeco just great, and hydraulic hoses route nicely to power beyond. And the final working height is 8 inches at the lowest (the splitter beam is about 7 high, and I added some feet below that to keep the fittings from hitting the ground), and 28.5 inches at the highest the 3-point goes. I have a hydraulic top link too, so tilit it way up for clearance when travelling off road. The splitter's hyd control lever mounted position works fine for both on the ground and fully up positions.
While using it to split about 16 pcs of elm, I quickly realized the working table provided is just a bit too small. If you split something large, and half of it is laying there on the table opposite from the control side, then you start to split the other half, one qaurter will hit the half laying there waiting, and knock it off the table. If there was another helper working over there, he could help keep this from happening, but since I will work alone most all the time I decided to add some area to the one table.
Also, after using it on the elm wood, I decided the wedge might as well be sharp instead of the provided 1/16 inch blunt edges, so I sharpened nice edges using a bastard file. It cut kinda hard, certainly harder than mild steel. Hopefully it holds an edge better because it is hard. Did not try it again with sharp edges. Did also grease the piston as instructed (red grease in pictures).
No sign of any weakness, twisting or bending of anything yet. Will try to find some oak to really test it this week sometime.
New (final) pics. Showing the feet added, the improved larger table on one side, and final paint.