I upgraded about a week ago, I downloaded the iso file, and forced it to upgrade that way, rather than waiting for Microsoft upgrade Prompt.
So far quite good, everything appears to be working fine, trackpad, wifi etc. all were working out of the box, although weirdly the scroll function does not work natively in the operating system. So scrolling through the apps in the start menu or setting, or even the edge browser I've found, can't be done. It's probably just a driver for the synapse trackpad, I'll check their website for a update.
I did do a destructive install, so my files were kept, but all my programs were removed, I like to install the fresh in case there are issues doing a upgrade.
Few issues, Microsoft has made it harder to change a few default apps, the browser for instance. You have to go into the settings, system, default apps and force it to change......naughty naughty Microsoft.
And the hugely worrying amount of personal data Microsoft is collecting by default with Windows 10 as seen here
http://arstechnica.com/information-...-much-privacy-by-default-heres-how-to-fix-it/
But thankfully most of the stuff can be turned off, but not all of it.
Personally, I'm liking Windows 10, there are a few quirks, It still has a hybrid feel, settings for example, you have the new settings in the start menu, but for anything deeper it puts you back to the standard control panel, everything is called a App, not a program, and I haven't found a way to make a group in the start menu, so all your programs are scattered about the place, rather than being able to create a 'Photo Folder' in the start menu, and put photoshop, paint etc like you could with Windows 7 start menu, in that one folder making it easier to find stuff, you'll have to remember it's name, which isn't always easy.
but overall I'm quite happy.