Handled both versions at Shot today, I think they are both going to be huge sellers, but if the price difference is only going to be $40 to get M390 that's not even a choice! The size/thickness me is a much better general EDC size than the 0560 or 0550 is. Kershaw/ZT really crushed all the other knife vendors new offerings there, you could see the excitement difference in their booth compared to the other manufacturers.
(Disclaimer: these are probably prototype samples so who knows what can/will change). I'd say the only things I didn't like is that the samples they had there that I played with was the CF scale was very smooth it would certainly be very slippery with wet/sweaty hands, I'd say it felt more slippery than the 0560CBCF. I also thought it had some pretty sharp edges on the insides of the liners I could really notice them when gripping the knife. The only other thing that bothered me was that I played with two samples of each version over the show and all four had different levels of blade retention and ease of deployment, ranging from almost falling open, to so much detent engagement I could not get it to open with the thumb stud at all, two others I could open with both the flipper and the "thumb stud" without issue, all had smooth pivots so it was not pivot tension. Hopefully that inconsistency gets worked out in production but if the 0560 samples I've owned/handled are any indication it probably won't be.
People were really pumped about the Emerson collaborations too, they were nicer than I thought they'd be though most are on the small size for me personally but at the price point they are really going to be popular. I particularly liked the CQC4 and 5 but both seem smaller in the hand/person than their specs would seem to indicate at least to me, but considering both are certainly going to be under $50 on the street, that's amazing.