The following are just some rants from my own perspective. I don't expect them to be agreed with by many, if any at all. I'm a fussy SOB that isn't shy about offering an opinion though.
I've seen those videos before. Dan Clark posted a link to them a while ago. I hate to say it, but I said the same thing the first time I watched them and I'm even more convinced now. I'm just not impressed at all with the fit of the joints coming off that saw. The cornice and and the skirting boards joints are absolutely pathetic. It could very well be the walls, the person doing the cutting, who knows... But, I know I can get joints that fit ten times better than that with saws that cost 1/8 the price of the Kapex. If the intention of that video is to sell the accuracy of the saw, they did a horrendous job. At the very least they could have made sure the cuts in their videos were perfect. Those cuts look like they were done by a hack on his first day on the job.
The Kapex also has an amazingly small work table on it. In a few of those pictures, the material being cut looked like it was being supported by just the smallest of amounts of stock. For the workshop, that might be okay. For field use, that's horrible. A good set of
Sawhelpers will get around that, but that's a very expensive thing to add to an already very expensive saw. Without something like the Sawhelpers, the size of that table is going to be an enormous issue for me. I don't think I'd ever want to use that saw without a set of Sawhelpers. Festool should also take a look at the Sawhelpers and steal some ideas from them. Their support system is dramatically better than the system that Festool designed to go along with the Kapex. Quite a bit less money too.
One other thing that annoys me about the Kapex is that its just ever so slightly shy of being able to cut a 4x4 in one pass. That might not mean much to those of you in Europe and in OZ, but that's a big deal for a miter saw here in the US, especially one that will be used on a daily basis by contractors. I don't do many decks today, but I still install my fair share of railings and so forth. Not being able to cut through a 4x4 is a huge negative.
I am very impressed by the some of the overall features the Kapex has and especially the dust collection. However, I'm going to need to be very convinced in person when it comes to the performance of that saw (again, I'm going to blame the lousy videos for now). Performance means a whole lot more to me than fancy features. Those videos leave me very underwhelmed. Keep in mind, I'm extremely picky when it comes to miter saws though. However, my Makita puts that Kapex to shame in terms of the accuracy on the skirt board and the cornice videos. I can also cut a 4x4 with my Makita in one stroke and I can lay at least a 14 inch wide board on my saw without it moving even the slightest little bit due to the amount of support from the table. The Kapex looks like 4" wide boards will roll right off of it. The area will this will be the biggest problem is in fine tuning moldings that have already been cut to length. Sometimes you cut a piece of base to 4" long and you just need to shave the slightest of hairs off it to make it fit perfect. Without much of a support table, a cut like that is an accident waiting to happen.
The Kapex looks like it will compete very closely with my Makita in terms of cutting height for things like baseboard and so forth though. The Makita isn't very good in that area (Dewalt and the older Deltas are the best by far... The Dewalt is a piece of garbage though) . However, with the Kapex, you're only going to get that extra height on thinner stock, you won't be able to cut things that tall when they are 2-3" wide.
Just my opinion, but this saw with its compact design, really looks like its more designed for the Euro markets than it is for the NA markets.
Sorry for the rant. I know most of you will disagree very strongly with most of what I said, and that's fine. I'm just not impressed. I expected a lot more coming from Festool. Especially with the rumors of what that thing is going to cost.