Worth it and then some with the iGames discount and if you pay for a year in advance you can get the cost down some more.
270 something games everything from Team Fortress 2 to Dynomite and other pop cap games, Left for Dead, lots of shooters and cool games.
It's pretty easy to use even for a computer noob like me. We've only got 13 accounts and probably only use 10 of them on a regular basis but compared to what you would spend on 2 or 3 computer games per PC you get access to a lot more.