Another vodafone home & broadband customer here. Customer service is good (had to report a fault recently, it was referred to eircom and repaired within a few days).
Broadband service itself can vary - I'm supposed to have 3MB speed, but have rarely come close (best I've ever noticed was 1.65MB). Got a letter some time back from Vodafone to say I would be upgraded to 8MB speed, but it hasn't happened yet!
Intermittently, I can't get internet service at all - I'm guessing it's a contention problem as I eventually do get online (doesn't help if I'm trying to check something urgently or haven't much time!).