I've had my CS-2 since I bought it new in around 1981 or 1982. It's been on my pedal board for every gig since then. Now, it's on essentially all the time -volume at 3 o'clock, compression at 9 o'clock, attack full on (all the way to the right). The only time I have it off is if I'm using a guitar with humbuckers -then I tend to notice that it may take away a bit from their sound, but with my Tele and Strat, it's perfect.
It provide me with a nice boost that mixes well with overdrive. Alone it provides me with a very musical sound. You don't notice any overly squashed, gimmicky type compressor sounds. I know Mr. Keeley does good work cause I have a Boss SD-1 that he modded, but I have no desire to try out another compressor.