I used one for a little while. It was a pretty good camera. My only complaint with it was it took longer to adjust from light to dark when flying in and out of darker areas than some of my other board cams.
I never tried PAL so I can't sat whether it makes a difference. I would be curious to know if that is true though. I would like to pick up another to mount in the front of my I1.
I've got 2 FatShark cameras. Not unhappy. The cables are a pain to use with switchers or VTx other that Fatshark brand. You'll have to make your own cables.
I've got the Fatshark 600TVL and the 700TVL. Got to say I prefer the 600TVL. Better colours and OSD figures are sharper. No noticeable difference in overall image sharpness. I use them both in PAL.