Personally I think design has more to do with how much wood you split and how willing you are to work. I am lazy, yep I said it. Most of the commercial cheapie splitters will serve the general homeowner for years with just a little routine maintenance. Most will split big knotty rounds with little effort. What it boils down to is how much speed you desire. Cant beat the speed of grapping a round and throwing it onto the splitter and hitting a lever and watching it fall into splits. Not a bad plan for someone that splits small wood and small quantities. Try doing that and splitting 4 or more cords in a session. Your back will give out way before the splitter does. Then you have the log lifts, yep just roll that big round on the lift and raise it up to splitting height. Works pretty good as long as the rounds are staged and dont have to be moved very far, and a mulitsplit wedge really helps. Again, your back will give out rolling those big rounds to the splitter long before the splitter quits. That lift also adds cost to your splitter, but being a lazy person, I would prefer it to picking the rounds up by hand,, even at the cost of a little speed. Than you have us really lazy people that use a boom to pick the rounds up. I simply walk over to a large round, hook up the log dogs and hit a button and the log gets dragged to the splitter and lifted on the beam. Yep it takes a little longer to get the wood on the splitter, but I can do it all day with out a hurting and sore back. My splitter probably runs rounds thru it about the same speed as any other splitter, but instead of splitting for a hour and taking a break, I can split for hours. At the end of the day, I can probably split just as much wood, with less effort as someone lifting rounds by hand and not be as tired at the end of the day. Now thats not to say my splitter can produce tons of wood a day with just one person doing all the hooking and splitting, but give me a crew of good workers and it can make their tounges hang out making production. Even with a large crew of feeders and stackers, we will give out way before the machine does. I have done a cord in fifteen minutes, split and stacked with 5 people, and every one of them was sweating and breathing hard trying to keep up. Yesterday, we did 2 cord of 30+dia rounds in two hours, split and stacked with three people. I could have beat that a little if my truck tire hadnt went flat and I had to blow it up before I could move the trailer full of splits to the stacks. As a one man splitting crew, I can do about a cord in a hour with good wood, but even with a boom I need help with the big stuff.