I paid five times this to buy it from GOG when it first appeared here. I'm only about halfway through (Lungfishopolis) but I can already say that it was a bargain at $10. If you don't already have it, $2 is an insanely good price and you should get it :-)
Same here! :) I just passed lungfishopolis. I already played it on X-box, bought it on PS2, and bought it on GOG. I don't think I'll be buying the Steam version, but it's such a great game, I might buy a copy for some people in my friends list.