TalkTalk business is supposed to have good customer support but I wouldn't touch residential with a 10ft barge pole.. for the reasons you mention...
I have no issues with Adam or Pulse8, just something about the whole setup doesn't sit to well with me, I feel it will fail, specially with the attention its getting currently.
Also not getting information confirmed and conflicting information that keeps hitting these message boards... at one point (not checked recently) they where claiming to sell dedicated or near dedicated lines but that was not the case...
and then the issues from a few people where they have been told issues with BT have affected the supposed TTB connections... not to mentioned I emailed them twice asking for information and still had no replies... that was over a month ago...
I looked at pricing recently, and couple of weeks later received an email asking me to supply payment details to start the order/service.... I didn't place an order??
and as I said above, I don't really trust resellers "anymore", Plusnet basically resell BT WBC and they constantly say issue with BT, we've told them, seems they are powerless... at least if I'm connected to Sky/TalkTalk's LLU (network) they are only ones at fault.
either way, I'm sure Pulse8 are great, but I remain sceptical about there abilities to host you guys as guests and with the migration process requiring me to regrade to ADSL and then start a new fibre upgrade, they can swivel! my house dropping down to 3mbps will probably blow my router up

(I Joke) also believe they wanted £50 to migrate us, (which is the only joke not meant to be funny)
WBC @ 4500m> TP-Link TD-W8968v3
FTTC @ 450m > HG612 > Asus RT-AC87U
FTTN Coming Soon