Hi,
I have been dealing with Magnet for the past 1.5 years when I moved into a new development in Dublin 13 and have found them to be very good. Of course there are a few issues as the technology is pretty new, but however, their customer service is very friendly and responsive - a very pleasant change from the nightmares I has with eircom, Corus and NTL. They actually respond to e-mails, return calls and keep committments!
Also, if you talk to them, they will be able to work out a package that is actually chepaer then going for Sky and separate Phone / Broadband - I did this about 6 months back.
The most importnat thing is that with Magnet, I can pretty much use any point in any room for wither TV or Phone or Internet... this is great!
Hope this helps. Cheers.