Been a long time since I've checked this thread, and it's interesting to note that little has changed with Demon since my last visit. The gentle decline of what was once the only ISP in the country worth choosing if you needed something beyond the basics.
This time round I've been with them for five years, most of those on a business (cost not class it has be said) connection, but I've had enough.
Something else you need to know before moving across to the business service is that it IS NOT as advertised a 24/7 dedicated UK support, but in fact only Monday to Friday 9 to 6 support
Confirmed. I've tried challenging them on this more than once, but as ever you get the runaround on the phone.
Long story short: I've had connection issues for about 18 months now. Three engineer visits to my property, too. The first found nothing wrong, the second changed some BT wiring, so no charge. The third changed my faceplate after I'd specifically asked him not too after the previous engineer told me my internal wiring was clean, resulting in a charge from Demon which, a year later, I'm still refusing to pay. The reason I'm refusing to pay is obvious, but it's made worse by the fact that I've asked Demon to detail what repairs were made, when, and how they improved the service. They can't answer the first, they've given me three dates for the second, and the third is moot because I still have problems with poor transfer rates during the day, even though I'm paying through the nose for 'priority' traffic and support.
All of the engineers have told me I should be able sync at around 6Mb (I used to regularly get 5.5Mb until the problems started last year) but now I get around 4.5Mb. I could live with that if it weren't for the fact that - as of the time of writing - I'm trying to rsync some data down from a remote server at a staggering rate of c. 48Kb/s. They only way to get more data through the pipe is to make multiple connections (makes sense given the congestion issues outlined on this thread) via FTP. I've queried this with Demon as recently as two weeks ago, but the best they could come up with was some wooly excuse about a stale connection. They couldn't, however, offer up an explanation as to why I can [sometimes] get c. 420Kb/s if I download data overnight (after midnight).
I've got more documentary evidence of their lies than I care to mention, but the bottom line is this: I've had enough. They don't care what they tell you, and they don't care about your problems. Everything that is wrong with your connection is your fault, or it's BT's fault. They've never ONCE admitted there may be a problem with their own network. Not. Once.
So, like others who are leaving them, I'll be moving away this side of the New Year. Enough is enough, and they can kiss my backside for the engineer fees, too.