Well my hearing has almost returned from the concert I went to at the weekend, here's what I thought of the bands:
Canterbury: In my view they just aren't ready for the big stage, they've got a "posh geek" image problem and don't yet know how to play an audience. Their music however is pretty good for a electro-pop/rock fusion and I enjoyed their set.
Cancer Bats: Polished and seasoned performers with ample stage presence, musically somewhere between Aamon Amarth and Children of Bodom. My partner particularly enjoyed them and wants to see them again when they next headline a gig but for me it just didn't quite click, i'd rather see Bodom.
Billy Talent: Simply awesome punk/metal, brilliantly and professionally performed and a slick performance. Whilst not the most audacious stage performers they where solid, and their set was simply brilliant, it might also appeal to fans of indi and alternative genres. Their set plan was brilliant for fans, with their hit "Fallen Leaves" repeated in the encore when the crowd called for 1 more, followed by the suprise unfurling of a gigantic red flag for their earlier hit "Red Flag".
In all, the best concert I have ever seen, thanks in large part to Billy Talent who I heartily recommend.
Also for fans of alternative metal the latest Genitorturers album Blackheart Revolution is out today in the US, but us UK folk can't get it just yet (officially or by other meens) so i've not yet heard it, early reviews seem good though so fans might want to check that out.