I've been with Sky for a few years now. I wanted to get away from BT line rental and foreign call centre support. Sky LLU was available at the local exchange, and unlimited bandwidth was being offered at reasonable cost from Sky.
There were line speed issues initially, but this was eventually traced to a faulty DSL cable. A new cable fixed that problem.
Reliabilty has been very good, with virtually no downtime. Recent disconnections have been caused by Avast home network security being problematic and conflicting with the Sky router firmware.
If Sky keep the present level of service, then I will be staying with Sky.