Windows 10: In-depth review

Anandtech did a good write up on it here:

http://www.anandtech.com/show/9543/the-windows-10-review

There conclusion is much the same as mine, but my recommendation still stands for Windows 7 desktop users: stick with it Windows 7. Desktop computers are easy to overhaul and repurpose.  The Windows 10 free upgrade supposedly (I will be confirming this about a week from now) makes your old Windows product key invalid 30 days after upgrade (if you don’t roll-back). So, if you significantly change the system later, you may be stuck in a situation where neither the old nor the new product key work to activate your Windows.