I have a Surface RT, not Pro, but I have almost completely replaced the desktop with it - maybe 90%. The few things I go to the desktop for are things I would do the same if I had a Surface Pro. I had almost completely gotten out of playing PC games, but Hawken came along causing me to occasionally fire up the desktop to play. I probably would never install SQL Server (Im a dba) on a Surface Pro either considering the limited amount of storage. The other thing my desktop does is act as a home server. It has the main shared versions of all my photos, music, videos, TV recordings, documents etc. It is backed up regularly and relatively secured. Although I'm rarely on it, it supports the Surface and other laptops, XBOX, etc with content. I also rarely remote into the desktop run software I don't have on the Surface RT.