I'll tell my story on this, then you can decide whether to use this for anything.
I am a computer engineer, and the most important thing on my BB connection is the reliability of it. I have to be able to connect from home during evenings/nights/weekends and if I decide to work from home. With BT, I and around 20 colleagues in the department I'm in never had a single problem. Not one. BT was not the cheapest, but it was by far the most reliable BB service around in Cork at that time.
Then BT withdrew from Ireland and Vodafone took over. Well that is the worst thing that has happened to my reliable BB. Cutting a long story short, all 20 of us is now on different providers. Magnet, Digiweb, UPC. And we are all very close to being back the same level of reliability and speed as before.
None of us has gone to Eircom, because they are also considered a shower of something, but they are nowhere near as incompetent, moronic, downright rude cunts as anyone even remotely associated with Vodafone BB. What a shower of totally useless people they are. Don't believe me? Read this thread on boards.ie
Home Broadband - evening speeds - boards.ie.
So whomever you decide to go with, don't go with Vodafone.
And breathe.