Was with Orange for about a year and a half beginning about 2 and years ago (until I moved house).
Started off wonderfully, first month was fine, then their router started to have issues, and was replaced.
Not long after this I started to find the connection would go off for a day or so at a time.
Eventually this dropped off totally, and I went for 7 WEEKS without a connection. Spent hours on the phone to India asking to be put through to the escalation department who were in the UK and were actually fairly good. (Mainly because they'd been trained to deal with the poor sod who hasn't got any internet)
Engineers seemed unable to fix the problem, and after a month of no connection and constant promises to get it fixed quickly I looked for another supplier. Finding that it would take a month to get a new connection in whereever I went I eventually made the decision to leave, gave the notice, and shazam the internet came back on!
From that point forward I had 2 new routers but fairly good speeds...