Double post because it's my forum, dammit (and it's been well over a month).
After dealing with a few touchscreen devices (an ASUS ultrabook, an HP Stream 7, and my Surface Pro 3) over the last couple of months, I've found that touchscreens, of all things, seem to be Windows 10's biggest downfall. I've run into several situations where I've taken a system out of suspend or rebooted it, only for the touchscreen to not work at all. The Surface, in particular, occasionally freaks the fuck out (where if I touch in the upper-right of the screen, regardless of orientation--making it clearly a software issue--it does weird things like recognize drags as rapid taps). And it's not just my Surface, either. The CFO where I work uses a SP3 for his company laptop and he runs into the exact same issues.
Rebooting--or, on rare occasions, waiting--fixes the problem, but it's still really bloody annoying. How in the hell did that manage to make it into the full release? I remember reading about touchscreen issues earlier on, but the fact that it's happening almost two months after release--to a variety of machines, no less--is pretty damn silly.
That said, when it's on, it's really on. Having separate tablet and desktop modes that can be toggled at will was a wonderful and welcome addition, and the automatic prompt to switch works properly most of the time (if it doesn't trigger because of some odd condition, it's just a swipe and a tap away). My SP3 and Stream 7 both shipped with Windows 8.1, and that felt downright clunky. Just the simple fact that universal and desktop applications are treated appropriately (desktop applications are full screen in tablet mode, universal applications are windows in desktop mode) makes the experience so much nicer.
Using desktop applications in tablet mode certainly isn't perfect, but that's largely unavoidable. If you're using Outlook and open up a calendar entry, the calendar entry will launch as a full screen window rather than a floating window, as expected. It seems like anything that can be maximized will be maximized. It does support floating windows, but it only seems to display them as floating windows if it's a fixed-sized dialog box. Regardless, it's a hell of a lot better than the experience of trying to use desktop applications on a Windows 8/8.1 tablet.
Edge both pleases and frustrates the hell out of me. It's lean, it's mean, it's fast as hell, but the UI is kind of wonky and buggy, particularly with scrolling. Web pages that use browser user agent sniffing can predictably fail in weird ways, but that's to be expected. When sites are written properly, compatibility is great. Developing for it is wonderful as well (I'm a professional web developer now, in case I haven't mentioned it yet). IE11 required zero additional effort from me and Edge continues that trend. Considering I've already worked around one particularly annoying Firefox regression this year, I'd say that Microsoft has come a long way.
The forced automatic updates can go fuck themselves straight to hell, however.