Hey!
Overall, using build 162, I don't experience any major problems, but there are some quirks that I still don't like/that didn't change since Windows 8.1:
1. Music still stops when screen goes off on SP3. Double checked power options, set sleep to "never" to test. I can listen to Spotify on my phone when screen turns off, it's too much for Desktop system. On phone I have Insider preview too, and seeing as those systems really behave alike and share features and options I can't understand it. I was hoping they would do something about it in new Windows.
2. Will there be new on-screen keyboard for Windows 10? WP10's new keyboard rocks, meanwhile Desktop variant had few tweaks but still looks like simple exercise in coding- maybe some transparency at least to match theme settings or tint of color here and there? Ergonomics is ok, but IMO looks leave lot to be desired seeing as rest of system components look.
3. I'd love to see option to adjust start screen size for Tablet mode- I got some essential things pinned there and they look really small when you decide to switch to Tablet. It is not strictly matter of me having trouble with finding or tapping something... Start screen looks really empty as of now, I liked bigger tiles from Win8.1 better
4. Notification icon is white, meaning there's something there to check, most of times it's empty...
What do you think? Can you relate? Maybe for some, like number 1. there are some fixes I am not aware of?