I recently got the windows 10 for my desktop.
Personally I quite like it, but at the same time it feels flawed if you have a desktop.
if your a windows 8 user, the start menu is now that but by the start menu rather than the full screen that windows 8 would do
Starting up does feel a bit faster and it does look nice
If you are using windows 7, the upgrade doesn't effect any of your applications, they will still seamlessly run
Also if your a windows 7 user, you can now get apps, one i needed was the onecalender which I love usuing, that said it also makes connectivity alot easier.
my biggest con to this is, It feels like its designed with tablets and laptops in mind rather than for a desktop pc. I say this cause it has all this stuff about knowing your location, connecting to other wifi's & hotspots, etc. It feels like it is treating the desktop as a movable item, and it's not. I feel they should of divided it between desktop and portables. I think that is its biggest let down for desktop users.
Also Cortana, you must be connect to the internet consitently and your user account must be integrated to your hotmail account, or something. It can't be private. That may not be a big deal for some, for me I'd rather keep my private offline logon, which means I don't get to use cortana.
I've not had it for a day yet. My opinion though is its perfect for laptops, in fact i can't wait to get rid of windows 8 with the flying windows all over the place, and merge it with the windows 7/xp feel. But if your a desktop pc, unless you have windows 8, stick with windows 7
I can keep updating if you like