I've been with Plusnet for over 3 years, since moving outside of a Virgin Media service area. The connection itself has been almost rock solid, however the provided router does experience issues every couple of weeks, particularly over Wifi, requiring a reboot. Unlike some providers they provide the connection credentials which can be used with another router.
The price is decent for the no-frills service that they provide, however they will sting you with a significant post-contract price increase and weren't willing to match new customer pricing, with the rep calling it 'unsustainable'. They will accept transfers in from previous customers with no waiting period, however it's a rigmarole I'd rather have to not go through.
Support is UK based, phone lines are open for extended hours and advisors seem to be reasonably knowledgeable and not forced to follow a script on the few occasions I've had to call them.
Time With Provider: 3 Years
Package Name: Unlimited Fibre Extra