I am looking for the best technical performance.
You might need to qualify that a bit. Do you mean you need particular technical features or that that, technically speaking, it just works
In terms of knowing what they are doing, good support (being on BT's case for you when there is a problem for instance) and technical features AAISP is the proverbial quadruped's gamete factories.
For technical features you have
- pure unfiltered (they are one of the few ISPs that don't even subscribe to the IWF filter lists) unshaped (aside from the basics required to keep TCP running smoothly) bandwidth
- an excellent control panel (probably a bit confusing if you are a beginner, but a beginner won't be looking at it anyway) that allows you to tweak various parameters should you desire and lists detailed accounts of any problem reports (including communication between them and BT so you know what is going on) and a detailed view of your recent bandwidth use (broken down by the hour).
- native IPv6 - be ahead of the curve! (though I've still not got around to setting my home network up for that yet...)
- free IPv4 addresses (assuming you can justify them, though that isn't hard if you do actually plan to use them: I have a few couple of web and mail services that need their own fixed addresses for SSL purposes which was sufficient to qualify for a /29)
- fully delegated rDNS
- a billing system for bandwidth use is rather flexible, though some find it confusing
It is easy to run up a high bandwidth bill if you do anything big during the usual working day (their peak time for billing), but conversely if you schedule downloads for the cheap period (0200 to 0600) you can potentially drag down enough to blow some ISP's monthly caps in one night (my line can pull over 12G down in a single hour if I let it), and upstream bandwidth is unmetered at all times.
For the avoidance of doubt: I have no connection to AAISP other than currently being a satisfied customer.
Of course if you just need the basics you might find BT's offering (even the lowest one) works perfectly well for you, and it may be significantly cheaper. Aside from occasional exchange congestion (which will affect all
ISPs just the same) at times in some places and apparent P2P throttling at busy times, I'm told the services is speedy and reliable (caveat: I've never used it FTTC via BT myself, I've been an AAISP subscriber since moving from ADSL).
Current ISP: Andrews & Arnold (AAISP, aa.net.uk) via FTTC at ~36Mbit down & ~10Mbit up, joined July 2011.
Previous setup: Be Pro with UploadPlus (ADSL2+, AnnexM), 12ish Mbit down, 1.6 up, happy customer for ~2.5 years.
Edited by dspillett (Fri 27-Jan-12 17:38:33)