Finally I gave up and upgraded my Windows 7 Pro to Windows 10 Pro. I resisted upgrade to 8 and 8.1 mostly because when I tried them in my new laptop I was not impressed at all. Worse, I lost my faith in MSFT. It was mostly because user experience for me was just terrible. I am more in favor of OS with less clutter and less GUI heavy… and Windows 8 was opposite of it.
What I like: After playing with Windows 10 preview, I was genuinely impressed. I liked that MSFT has replaced metro desktop with good ol’ start menu, even if it is not same as old one but to me it is still more functionally useful than metro. More control over update and more option for privacy settings. Most good feature for me was inclusion of Hyper-V server in Professional edition. This relives me from using 3rd part hypervisors (read Virtual Box Smile). And another useful feature for me was PS 5 with WMF 5.