I'm really liking W10 personally.
- I'm using Cortana much more than expected. Alarms and reminders in Windows have reached the ease of use to get me to actually bother with it, I like the quick Weather/news scroll without permanently plastering it to my desktop, and while I don't find voice necessary or reliable enough for normal use it has come in handy a few times. Used it yesterday a bit while eating a snack for example, kept my keyboard clean =). Obviously most of Cortana's function could be done in other ways, but built into the OS and easy to use is nice. On the negative, it just launches a web search for a ton of stuff google voice can provide in client.
- Virtual desktops are great. Again something I knew you could do, but polished and easy to use here gets me to actually do so. I set next/previous desktop to the upper side buttons I never used on my LG502, and snap back and forth easily. Very nice to have one layout for work and one for web browsing/games/entertainment etc. so I can take a quick break without messing up my workflow setup.
- I have a Surface Pro 2 and liked the 8.1 start page a lot for touch use, so I never had an objection to it. But the implementation here is certainly superior for desktop use. Lets me clean up my taskbar quite a bit, and I've started messing with custom tiles and such to get it to just be visually appealing.
- Not amazing or anything, but I do like most of the new apps. I already have a lot of capture software and hardware with necessary settings control, but I will probably use the XBox app for more casual recording of occasional game clips or such. In any case, nice to have a built in option.