My computer has windows7 and I find it good and have only heard bad reports about 10 so I'm staying well clear of it. If it aint broke don't fix it  
I heard of horror stories were somebody went to lunch and came back and his computer was taken over
by win10
I blocked win10 in several ways 
In my firewall no more effing bill allowed
No more updates allowed
Killed the pop up in the register 
Deleted all downloads that prepared his ugly campain