I've been on some form of Paxil for about 9 years now. Overall, it has been fantastic. My anxiety is nowhere near as bad as it used to be. The only time I've had any trouble with it is if I go off it for a couple of days. The withdrawal is terrible. I get very jittery and shaky and the stomach aches I used to get before I went on this drug come back. I've tried going off it before, but have only manage to get down to 20mgs, which is where I am now. Any lower and I get withdrawal.
Paxil CR, on the other hand, was a bad idea all together. My doctor tried to switch me to that several years ago, and it was not a good experience. I became severely depressed and started having suicidal thoughts. Needless to say, I was put back on regular Paxil and everything went back to normal.