I bought Counterstrike Source... well, I wouldn't have bought it if some friends wouldn't tell me several times to buy it. It was only 3,75 euro anyway. And it's really not a big difference between it and the old counterstrike, besides the improved graphics, ragdolls and new models for weapons.
The gameplay hasn't changed.
Oh btw, today, just surfin' on the net, I saw probably the most awesome gif :
Heh, but since then I bought a lot of games already.
And the gif is so sophomoric. I guess I feel that way because I am almost forty years old.