1. The sound was the best I've heard out of any hardware in a long time. It really is like having a truckload of instruments in one box; Piano, Rhodes, Wurli, Hammond, Wavestation, Karma, DX7, several analog synths, and a huge effects rack. A lot easier to carry to gigs, though. The possibilities with vector synthesis are interesting, since each patch can have one or two different synth engines. Kind of like the Yamaha SY22/TG33 (they had 2 pcm voices and 2 2-operator fm voices for vector synthesis) on a lot of steroids.
The acoustic pianos are exceptional, and the drawbar organs had the excellent sound I expected, since I use a Korg BX-3 regularly. The electric pianos sounded every bit as good as the real things I have here at home. With the engines that make up these classic sounds, there is not just a huge weight loss, but no need for the maintenance that the original behemoths require. (I'm not getting rid of my vintage gear, though...)
The analog models sounded wonderful; while I didn't have the time to delve into any in-depth programming with any of them, I can see I'm going to spend a lot of time with the AL-1 and MS20EX when I do get a Kronos.
The MOD-7 engine really interests me. It looks like it could also cover a lot of the ground that the SY77 does.It doesn't have the looping envelpes of the SY77, but there are workarounds, and while the non-sine waveforms are different than the Yamaha's, the waveshaping function should compensate quite nicely. Not sure if it compares to a TX816 as far as the polyphony goes (52 MOD-7 voices with dynamic allocation, vs 8 16-voice TF-1s with fixed polyphony), but maybe a DX1 or DX5 with a TX7 added, plus a bunch of SY77 DNA. The features of this engine blow the original 6-op fm out of the water, though.
One other point about the programming is the ams mixers; they seem to offer the same kind of processing as Kurzweil's FUNs. Great stuff.
2. The apperarance. It looks like the black Kronos will be a LOT easier to keep clean than the silver surface of my Triton. It definitely is drool-resistant.

3. The user interface. This is a nice compromise between a control for every funtion, and one data slider for everything.
4. The price. I know there has been a lot of comparison to the OASYS, but it's worth comparing to the instruments it replaces, too. The Kronos is an incredible bargain.
All in all, I really liked it. Enough to reconsider my policy of not working overtime at my day job. At least until I've got the money to buy my own Kronos.