I have upgraded my laptop from windows 8 to windows 10 a few months back when Microsoft launched it for all the users.
The main things I like the most in the windows 10 are >
It is a very nice combination of windows 7 and windows 8(customizable menu and new start button) and they have made it a very stable windows for all(as it will be last OS of the Microsoft)
Boot time is very less as compared to windows 7 & 8.
Also, They have made the User-interface very user friendly and it is the best among all including the previous ones.
But windows 10 make working like hell for the end users like me as most of the softwares like VLC, IDM, ShareIt etc. are not available for windows 10 till now. Though they said all softwares of windows 7 & 8 are compatible to run on windows 10, they are crashing many a times making working very difficult. Also, there are lot of driver issues as they are not available for all brand laptops, which are creating a lot of issues.
I suggest to wait for a time being to get the things done by Microsoft as it is still behaving like it is in the testing mode.
It will be the best after some time, when all the drivers and softwares are available.