Once I'd turned off the report back crap, things so far seem to have been progressing smoothly.
1) On install, it failed to detect my nvidia card properly until i rebooted a second time, after that it had no problems with the card. I rather suspect this was a side effect of the shennanigans with the nvidia driver update they had just prior to release. Been fine ever since.
2) One day, I attempted to sleep the system rather than shut down, as a test,and it just woke itself back up a few seconds later. Need to explore this now they've run through the first big update.
1) The white explorer backgrounds and toolbars. One of the first things I did was the colour toolbar hack. Still needs work in that area, but it's an irritation, not a showstopper.
2) The sheer lack of customisability (For example, anything pinned to the right hand side of my start menu will never appear in the most used programs section.)
3) Half the settings in one place, halfthe settings in the other.
4) the menu and heading text in modern apps is just way too large and can't be changed.
1) It's rather faster on the same hardware than 7 was. Stability is good too.
2) No issues with hardware support aside from that nvidia niggle on the upgrade.
3) I've always been impressed with the windows 8.1 task manager screens, and this is one of those improvements that found its way into 10.