Don't know if it was one of my posts you saw earlier as I'm always singing Metronet's praises.
Been with Metronet for 6 months now. I have found the service excellent. They are my second ADSL ISP so I had something to compare them with and they proved to be as good as, if not better, than my first ISP, Virgin.
Support is available by phone on a 0870 number office hours, but they have been known to deal with emails out of hours, even Sundays. Saying that thoug, I have never had cause to contact them about the service.
Like you say, it's a basic service in that you don't get email addresses and web space thrown in but you do get SMTP server access to send mail from any existing accounts you may have. Also, I can still use a couple of old Pay As You Go ISP email addresses to receive mail so you can get around this.
I am not a heavy downloader but am online for 20-25 hours a week and my biggest bill to date was £14. As you say, some dial-ups charge more than this.
I am biased, but to be honest I haven't heard anyone say anything bad about them. If you want to get a feel of what others think, check out their message board on this site click here
Just something to be aware of, the prices you quote are exc. VAT so it's from £11.75 to £28.18 MAX