I have the NT 22 ton splitter. I also have the 4-way wings that I managed to con off the store manager when I bought it. I tried the 4 ways once, and never again. If the wedge was mounted onto the I-beam instead of the ram, the 4 way would work much better. The wedge being on the ram, puts way too much pressure on the cylinder as the (4 way) wings travel across the bottom pieces of wood. The bottom pieces are actually wedged between the I-beam and the wings as the ram extends. The top pieces can simply fall away as they are being split, but there is nowhere for the bottom pieces to go. I hope you can understand what I am trying to explain. If you are looking for a 4 way system I would definately find one with a fixed 4 way onto the ram. So the split wood can simply fall off the end of the splitter without resistance to the splitter.
Otherwise, I do like the ram and wedge set up on my splitter. The log stripper works great.