It's the ergonomics of the vertical handle and the secondary safety switch that bother me about the Kapex. I tried one a few years ago, the cuts were great, the dust collection was superior, the handle/switches are a no-go for me. I much prefer the Dewalt DW717. It's a 10" SCMS with a horizontal handle and no secondary switch. Unless a guy is cutting 4 x 4 posts on a regular basis, I just don't see the need for a 12" blade? The 10" have far less deflection/wobble and give much cleaner cuts in the same material. Yes, 12" has more capacity, but if you are not using that, what good is it otherwise?
One of the other guys in the same shop has one of the non-sliding Dewalt's and it is horrible. It jerks when it starts and has that little extra tab on the switch too, plus makes a hellish sound when it runs. If the color scheme wasn't the same, you would never believe that the same company makes them.