It was quite possibly literally a lifesaver for me, and I never had any negative side effects or any of the horrendous withdrawal symptoms that some describe.
I was on 150mg most of the time, apart from a few months on 225mg.
I took them (each morning) for a couple of years for severe PND after DS2 (was under a psychiatrist and CPN.)
When I was ready to come off them (which, under advisement of the psychiatrist, was only when I had felt back to normal for a full 6 months) I went down to taking 75mg one day and 150mg the next.
I stayed on that dose for a couple of months, then dropped to 75mg every day for the next couple of months.
Then I switched to taking 75mg every other day for the next couple of months. I believe you can get a 37.5mg dose, which would have been more sensible, but my capsules were 75mg and they said not to open them up to divide the contents (and by then I had emigrated and wasn't able to get medications without paying an arm and a leg) so I stuck with the packs I'd brought over with me.
Then after that, I stopped entirely.
Coming off them was a really long, drawn out process, but without any withdrawal symptoms.