I use mine on jobsites almost universally and I still can't notice any squareness issues despite having dragged it around on the cart through some less than desirable locations. I still cringe a little each time it bounces over some large rock but somehow it is still true. I also have never experienced any real blade distortion, even when cutting less than a kerf width off the end. On my DeWalt 12" I routinely get some blade distortion as the blade "slides off" the edge when you're trying to take off a 16th or less. I have, however, had to adjust the lasers a couple times.
My only real issue with the Kapex isn't with the saw itself, but the Crown stops. They are like $220 for a pair of them, and it was disheartening to see that they weren't compatible with the UG table extensions. When you're cutting long crown (nested, upside down way) you really need more support than the crown stops can provide and usually my two MFT tables are being used as assembly tables, not to support long crown cuts. So I have been clamping on a sacrificial piece of wood onto the wing extensions from one side of the Kapex to the other. This makes it difficult to see the degree scale below and also interferes when someone else needs to use the saw for a cut.
Speaking of the UG extensions, I also am not terribly fond of their attachment method to the saw itself. There is a fine line between loosening the clamps enough to remove them and too much so the spring and whatever else fall out from the bottom of the wing extension. The strap thingees that hold the wings together are also too cumbersome and difficult to use so no one ever does. This leaves the inside edge of the wing extension vulnerable to dings and dents that can sometimes be enough to scratch the surface of a workpiece as it's being cut. I know it isn't that difficult to attach the covers, but for whatever reason no employee (me included most of the time) bothers to do it because it just seems senselessly difficult. In comparison to the simplicity by which the Kapex itself folds down it seems like rocket science, and at the end of a 10-12 hour day the last thing most of us want to do is try and figure out how the hell to attach these stupid covers so no one does.
Kapex saw - awesome. Saw stand - awesome. Wing extensions? The skilled engineers at Festool can do better I am sure.
