I've just purchased the 70D from DigitalRev. Really good service by the way.
I haven't had a lot of time to play around with it yet, but here are a few thoughts:
I upgraded from a 550D so I really like the autofocus system on the 70D. Outside in reasonanble light with a 17/40mm f/4 lens focus is rapid and accurate with no focus hunting. All the AF points seem to work equally well.
I like the integrated speedlite transmitter. Works well indoors so far.
The ISO performance is not much of an upgrade from the 550D if at all, which I expected. However, ramping up the ISO to 25,600 and shooting B&W gives some interesting results.
I really do like the Dual pixel AF in movie mode. I like the touchscreen for focusing in movie mode, although in low light this system hunts a lot when taking photos in liveview mode. Not a surprise and not really an issue.
Built in electronic level is very helpful and also like the shutter count in the battery info.
All in all I'm really happy with my new camera.