Oh yeah I was going to add that (but didn't think it was relevant) -- they're very un-enforcable (and a lot of the time illegal) in a lot of places (including where I am). I'm going to stick to it, though, for a few reasons:

1) I did sign it, and maybe a little bit of suffering will go a long way to helping me remember this lesson forever (and read contracts more critically).

2) I have almost 0 interest in the space the company was in.

3) I'm confident I can make a living without working in that space for a year.