If you can buy on sale you can't go wrong with this. The few logs it won't split makes good bon-fire fuel.
RuggedSplit 322-24-REX Log Splitter: 22-Ton, Raven 301cc, Log Lift, 24" Stroke
Rugged Made is one of the few splitter manufacturers who is more honest about their splitters tonnage ratings. You'll find that their 22 ton splitter will easily keep up with (and often beat)splitters that are rated significantly higher.
Years ago, I contacted the manufacturers of a number of splitters and asked what the recommended setting was for the pressure relief setting or "operating system pressure" on the splitter. With that number and the size of the cylinder, you can calculate the tonnage. (Real world will be slightly less due to friction and in the system.) Most would actually put out significantly less than their advertised rating. I'm not sure how they get away with the false advertising, but it's VERY common in the industry.
Rugged Made, American CLS, and Timberwolf were three who were fairly accurate in their ratings, at least last time I checked. There are a couple of others whose names I don't recall at the moment.
For anyone interested the formula to calculated pounds of force exerted by a cylinder:
Pi x R x R x PSI = pounds
Where Pi is 3.14 (approx), R is the RADIUS of the cylinder (not diameter), and PSI is the operating pressure.
To get tons, just divide pounds by 2000.
A 4" diameter cylinder operating at 3500 PSI would be:
Pi X 2 X 2 X 3000 = 43,982 Lbs = approx 22 tons.
To get 25 tons out of a 4" cylinder, you'd have to run it at almost 4000 PSI.