Fair points
@Caged - nothing much to disagree with there. However I have wholesale contracts with TalkTalk, Zen and a few others (not PlusNet) and am familiar with their setup. Zen pride themselves on focusing on quality over quantity... where others often get the cheapest they can, as long as it hits a lax SLA.
TalkTalk pings are really high though in my experience... for a VDSL connection, at least. I've dealt with fastpath ADSL2+ connections that are better on latency.
Just ran a quick ping from a client's office router... their primary connection is PlusNet and backup is TalkTalk.
To BBC:
PlusNet = 10ms
TalkTalk = 20ms
For TalkTalk, that's actually lower than normal... in my experience. I'm used to seeing it in the 25-30ms range, perhaps they've improved something since I last checked.
A Zen line in the same town is getting 7ms.
I don't have any Vodafone connections to test anymore, as we ditched them all, but was used to seeing similar things.
I definitely wouldn't go TalkTalk unless it was a leased line... their LL offerings can be good in the right area and for a competative price.
TalkTalk business support is great, but can sometimes be slow... their end-user support depends heavily on which agent you are lucky or unlucky enough to talk to... similar to PlusNet. With Zen I've only dealt with a trainee agent once and he was happy and quick to escalate to someone who knew more than him.