I"ve had my 22 ton husky for a little over a year now. Had some minor issues with the B&S engine, someone along the line had fooled with it or wasn't put together quite right- carb float bowl leaked and the gasket wasn't on properly, but otherwise, has been very good.
I split a lot of green hemlock when trees come down in the woods, and that is about as nasty as it gets and I've never had any problems. I'm only using it for my own heat, so it's strictly homeowner use here.
If I were buying my logs or splitting commercially, and didn't have the occasional very big logs that need the vertical option, I would consider an inertial type splitter, but to justify almost 3x the expense, I'd have to be splitting a lot more wood than I do. Other than that, or for a really heavy commercial operation, It would seem that the little Husky is as good as it gets for the price. Briggs engines are relatively easy to repair and/or replace if necessary.
One thing I like a lot is the design of the wedge. It has a "double angle" design. Don't know how many splitters have one like this, but the narrow entry and wider back splits almost everything well before the cycle is complete, so the "cycle time" is really not an issue except for particularly gnarly pieces. Working by yourself, you'll have a tough time keeping the thing fed, which is a good thing. The downside to this wedge design is it likely makes putting a "slip on" 4-way splitter or such difficult or impossible, but that's something I don't need.
To throw my two cents in on the "wide open" question, I run mine just a small amount backed off from "wide open," and it has never had any problems. It's a little quieter, uses a little less fuel and has plenty of power that way. May not make much difference, but I think they pretty much max them out with their governors, and it might add a little longer life to the engine.