I am with them - FTTC - migrated to them (away from BT) almost a month ago.
I can expand on my experience if interested, but in a concise summary :
- 100% uptime so far
- the phone service is just fine
- during the day, it is "snappier" than Infinity and ping times have reduced significantly
- despite what you might have read elsewhere (hotukdeals thread for example - this is some serious misinformation there), my observations and logging shows that it is traffic shaped a la their T&Cs, and this kicks in mid afternoon -> midnight
- single threaded http downloads are hit hard during this period - this is what people are moaning about elsewhere due to not understanding the underlying difference between types of traffic (not being nasty here, honest)
- streaming (in my case Amazon Prime Video) has worked extremely well - HD 1080p every evening with no problems (and I have burnt through about 180 GB of Amazon streaming).
- During periods of high load (high profile euro footie matches), it has seriously run out of capacity - I didn't actually realise that BBC iplayer would put out such low bit rates
, however, this really is the exception, not the rule, and from what I read on TBB even Zen had a problem as well.
Happy punter here BUT I walked into this with my eyes open after reading their T&Cs and accepting that a "free" service must have its limitations.
However, if you expect to download, for example, Linux ISOs in the evening using standard single-threaded downloads @ near sync speed, go elsewhere - you will be disappointed. Cannot comment on p2p as I don't do it.
If, however, you want a zero cost fibre service with known limitations, I think it's a bit of a bargin (ymmv of course)