Woo! Picked one up today after much deliberation - just can't justify getting the 920 for that much moolah. Very happy so far.
Haven't had any reboots yet, but I've only had it for about 12 hours.
The screen is actually narrower than that of my HD7, so I'm still adjusting to typing on a slimmer keyboard - but I'm sure I'll cope just fine!
I'm surprised by one thing - half the apps which are available on WP7 are not available on WP8. Why is this? No Skype, no Skydrive, no Photosynth. I'm sure there are more, too.
As far as the gyroscope question goes, here's an easy way to find out: just try downloading an app which uses the gyroscope - for example, Microsoft's own TouchDevelop. If I try to download it on my now-retired HD7, I get a message telling me my phone does not have a gyroscope; no such message pops up on my 8X, so I'm assuming it does have a gyroscope. EDIT: If you load up TouchDevelop, find a script which checks your phone's capabilities, it seems that it does not have a gyroscope after all :< Seems like a change for the worse in the Store, then, to not warn you of a possible lack of functionality.
@kregstrong: IMO the blue is gorgeous. Almost more of a purple. I love it.