I don't like Comcast at all. They are the only high speed ISP in our area, which is a huge bummer considering the terrible technical support, incompetent install/tech guys (so many screw up, I've encountered), bad service (no blackouts, but constantly bad line quality and DNS server F-ups). Other than that their at least nice... Oh wait no they're not. They've accused us of fraud twice, cut off our service and made us contact their fraud investigator, who cleared us each time, lickety split. Oh yeah and they lie, Almost made mah mom buy their $100 router/modem because more than one person assured her that no other router would work. Their evil out here man.
I know I'm biased considering the crappy service I've received, but to be honest, I've spent a fair bit of time on their Tech support forum and have seen an uncountable amount of bad feedback and reports, relaying the same stories as mine. I'd avoid them, If I were you, and you had another choice, but Trizoy doesn't seem to have had a nightmares with them, so you could luck out and be completely satisfied with them. I on the other hand have had many a unfulfilled daydream about exploderizing them up, preferably with some sort of Air-fuel bomb....