Actually, I normally only do two passes. I has to do two additional due to the poor lather quality. No issues on the reshave.
Y'know, I look back now at some of my early shaves with the 620 and I was a little disgruntled because I was getting only a thin amount of lather for the third pass. It did develop quickly, though, and became my favorite -- until I recently got a Savile Row 3824!
The 620 remains in regular use, though it's been shedding a bit more than I'd like lately. Nothing alarming, but it's still losing hairs here and there.