While I was on it, Enbrel was a remarkably efficient drug for controlling my PA. It was effective within the first week of starting it - fatigue lifted, swelling disappeared and I felt I was in remission. Even stopped taking Ibuprofen; was completely drug-free apart from the Enbrel (and alcohol!).
Unfortunately, two years or so down the line I have had to stop due to (perceived?) side-effects. However, I was what you might call sporadic with my treatment, using it symptomatically, and I was not on MTX, which can help stop side-effects.
Starting Humira on Weds. Hope it's as effective as the Enbrel.