I took paxil for 8 years, it was awesome. It does wear off though after a while. I had a mild panic attack on it one day, after several months which is a sign that it was either starting to wear off a bit, or it was not quite 100% curing me. But really, the stuff was amazing because I lived a great life for that first year. The next several years were ok but it's effect faded year after year. It was still doing enough though that I stayed on it for all that time.
I stopped it about 3 years ago because I wanted to experience life without any meds. It was ok for all this time, but recently things really caught up with me and I felt terrible. So I had to see my doc and put me on Escitalopram because he insisted it was better than me going back on paxil again. I've only been on it for a week though so far, so I can't really comment how well it's working. Give me a month or so and I'll be able to compare the two pretty well hopefully. It is promising though because the leaflet specifically mentions Social Anxiety Disorder, whereas it never mentioned that when I used to take Paxil. The Paxil was mainly for depression but it did mention Agoraphobia which is similar to our condition but not quite the same. Perhaps modern Paxil claims to work for SA too, but whatever.
Currently taking 20mg of Paroxetine (Seroxat). It's not very useful. Better than nothing.. but only just.