I agree with many here. Personally, 810 is a bit too much for EDC. I would take it if I know I would need Heavy duty knife, such as weekend yard work, camping, etc. Don't get me wrong, I love my M4 810 and as a fellow BKC enthusiast, you should get 810.
If you like low maintenance and don't mind satin finish and bright silver look of KW model, that would be good. If you are more Spartan in knife use, CPM-M4 can't be beat. Also Tungsten carbide glass breaker is nice and have 4 different combination of blade in original 810. (I have 810SBK, btw)
My complaints are two hold. One is as others mentioned, G-10 handle spreads jeans without sanding down. Also jimping on frame is very accentuated and that wouldn't help either. They make some hot spot, especially if you use the knife with bare hands. Secondly, unless you have relatively large hands, bottom part of the grip seems to dig into middle finger. So it is either you love 950 grip and shy away from bare hand grip of 810 (you can wear groves to make this perfect knife)
So, you should buy 810 anyway, but for a Work Day Carry, I use 940. General EDC would be 950, and Week End Carry may be 810.
MFL