i use it all the time, i have it set up so it show my what my xbox live friends are doing, the weather, my 360 gamertag, sing that tune (for finding lyrics), an album artwork finder, a clock for America (so i know when stuff is released in America) and a calc.
i find it really useful that i can move my mouse to one corner of the screen and get instant access to all of kinds of information which you would usually have to search the internet individually to find out.
i find that it doesn't even use up much of my ram to run all of those widgets, at most i use 2 GB of my 4 GB and when it gets that high i use the program ifreemem to suss out what is in the memory that doesn't need to be, and then it drops it back to like 900MB