I was early to the party with windows 8 on my Vaio Pro 13. There were a few issues with Visual Studio. I think they were graphic driver issues, if I remember correctly. Windows 10 Preview was a lot smoother. There were far fewer issues, and the big ones were just waiting on proprietary drivers. The only functionality I lost that I missed was Cisco VPN, but it’s probably been resolved by now. Visual Studio 2015 installs nicely and gave me no issues.
I am now running Ubuntu 14.10. My plan is to get a bigger SSD and dual boot Windows 10 and Ubuntu.