I just moved up to Windows 8.1 and I'm actually liking it. I initially resisted the change from the Old Start Menu to clicking on a tile in a giant mosaic but I decided to give it a try anyway.
Guess what? I like the tile scheme way better than the Old Start Menu. So now I read that Microsoft may go back to the original scheme. I vote no. At the minimum let me stay with the Tile Version as an option.
And, I really haven't found anything about 8.1 to complain about. It's working fine for me.
Dittos....it works great!