I've had mine since 10AM yesterday; and I'm actually fairly pleased, at least for effectively being a new platform. Thoughts, in no particular order:

- Love the build. Very solid overall.

- 16:9 means it's one long tablet. Oddly, it's actually fairly usable in portrait; can't say the same for my old 16:10 Transformer (maybe just better balanced?)

- The touch cover is, like most say, surprisingly usable. Desperately needs a way to no-op Caps Lock though.

- Screen res lower than iPad, but still usable. Difference not near as noticeable as between iPad 2/3, but too many factors in play to make an objective call there.

- Metro takes getting used to, but I like it (even with KB/trackpad).

- It's the first time I've seen proper desktop Gmail and Google Docs usable in a tablet browser.

- Performance is generally decent. Not blazing, but decent.

- Windows RT appears to still contain far more of Windows than we've been led to believe. Even `csc` is installed, but missing a few dlls.

- No SSH client for Metro yet. That's one of the risks you take on a new platform (esp. a non-Unix one), but still aggravates me.

- Snapping is very, very handy; nice solution to bring proper multitasking to a tablet UI.

- When touch-scrolling over on desktop apps (what few remain), the entire window "bounces" at the head/tail of the content. Odd decision.

- No central notification bin (like Android's shade or iOS's Notification Center). Have to rely on scanning Live Tiles if you miss anything.

- The back camera seems to exist only to make the iPad 2's back camera feel better about itself. Has to be the blockiest camera I've ever seen.

- Handwriting recognition is pretty solid. Wacom junkies will be very pleased when so-equipped tablets ship. (Capacitive styli still suck)

- None of the Twitter apps have really thrilled me. Given the circumstances, I'm not that surprised.

- OS-level share support is a smart move; similar to Android's impl but more thorough (sharing pops up a share pane from your selected app in the sidebar, instead of bouncing you out of your current app entirely).

- Printing is mildly unintuitive; you have to open the "Devices" charm and pick your printer. No one is going to guess that's how to print.

- On the bright side, our network printer/scanner was detected and installed immediately, with zero user intervention. Very, very far cry from the WinXP days.

- There's no way to see your precise battery life outside of the desktop (in the classic sys-tray).

- Presumably due to the use of pressure sensors vs. capacitive, the Touch Cover isn't quite as accurate without a solid surface underneath.

- If you're not using the keyboard (watching movies, etc.), flip the cover backwards with the kickstand out and it's nearly as stable as a laptop.

- The intro tells you about the basic edge swipes (right for charms, left for app switcher, top/bottom for menu); not mentioned is swiping straight from top-center to bottom kills the current app.

- Screenshot is Win+VolDown.

- Wordament can be played while snapped. This is dangerous.

- IE lets you swipe on the outer edge of the page for back/forward, which would be smart if this didn't occasionally clash with the app switcher.

Questions?

(PS: I typed this entire post on the Touch Cover.)