I did the upgrade yesterday, from Windows 7 to Windows 10. As I expected, it was painful simply because i've been used to the same OS for 6-7 years.
Now, it works fine and I'm not lost, "i'm settled". I don't really feel any performance improvments yet, but when you have a great computer already with SSD, there was already nothing wrong or laggy with windows 7. Maybe it's less expensive and can deal better with critical situations, I don't know yet but it feels stable (no crash or big bug or whatever).
I had big troubles yesterday with my video driver, because the OS itself was trying to instal it in the same time, causing systematic meaningless error messages (Nvidia drivers stupidity) but it was not able to install it apprently. I just had to forcequit the installer from my task manager and instal my own driver manually. So, everything's alright now.
I haven't seen any Metro crap or anything, the Start menu is full of crap so the first thing you do is delete everything and put your own softwares and shortcuts. Also be very careful not to agree to all the things allowing microsoft to spy on you and shit, it's a bit scary to see these options on Yes by default, but you can disable them (but you know that most people won't even look at them :x ).
The animations are fine, it's very smooth and it stays discreet (from my opinion). I don't really like the simple-design trends and they are everywhere on Windows 10 but therefore it stays simple and easy to read.
Don't forget not to connect with your windows live account, it's a trap ! They got me
Fortunately i found a way to disable the password being asked every time i come back to my computer.
Just, does anyone here have an alternative for the default windows image viewer ? (something fast and simple, like on windows 7)
Because on Windows 10, the thing called "Photos" is not really what i want. It's slow (due to collection and albums i guess, things i don't care about), you can't even zoom with the mouse wheel and the very useful button that fit to a pixel ratio of 1:1 (with the monitor) isn't present anymore.