I'm using it for my primary source of interwebz. I have a 5 GB cap, but I'm assuming they've changed it to 2 GB max now. I haven't ever went over my 5 GB cap and I average about 1.5 MB down. I sometimes get on xbox live and play games and whatnot as well as watch a lot of online vids.
If you want to do anything like stream Netflix though, it won't be a good choice.