I have been switching between Windows 7 and Windows 8.1 occasionally just for benching runs etc, but mainly I use Windows 8.
As soon as I was able to get Windows 8 to boot directly to the desktop without any of the 3rd party programs, such as Start Is Back I just simply stuck with it and learnt how to do the stuff on it that I did on Windows 7.
Although sometimes it is abit annoying having to use the start screen, it is only when I do a fresh install of Windows that I have to use it, just to then create a shortcut on the desktop.
I will be sticking to Windows 8.1 as I really am not bothered about the Start Menu anymore, and Windows 8.1 does seem to perform better than Windows 7.