I've been with Fab since October as my only source of TV. They've been pretty good, I experienced one outage (which was at the worst possible time after inviting the guys back to watch Rugby and drink more) which they apologized for and fixed the next day.
I've had a few instances of juddering/ buffering but support was fast and responsive and they've fixed it every time.
I mean with IPTV stuff will go wrong to an extent and the support is what separates providers I think. I've been happy with Fab so far, they've got a good selection at a good price.
If I could add one thing it would be the good food +1 channel/ good food on the archive but none of the providers seem to have this feature so it's not a deal breaker.
Amazing service! Yet to find something I enjoy better.
I wish it would add Love Nature channel though!