nice that would be cool. lost o space to store stuff. i would get one if i was shorter and my ceilings were higher. be nice to rool off of bed and straight into or computer area.
A: I plan to use computer as a TV. This makes it near impossible to watch TV from bed. (However, a couch can be put under the bed, or better yet, a futon!)
B: It can't be used as a chilling place as easily with other people around. Some other people are afraid of heights, and with two people on it their's concerns about weighing too much for it. Also bed's up high can make certain bed activities a bit less interesting and less fun.
I doubt i'd have a PC under my bed, likely storage or futon.