Have you had a look at
www.callcosts.ie to compare charges?
I looked at this site today, to see if my BT package is good value (or specifcally, good enough to recommend to my Mum!). The site is not bad, but it doesn't appear to show the contention ratio or to highlight the fact that you need to change your phone number for their phone & bb package.
This would be a big inconvenience in my case but would undoubtably be a showstopper for her as there are numerous people who have the current number, as it has not changed (apart from a leading digit) in 20 years.
I concluded that I am going to stick with BT for now.
Update: according to
this list of BB suppliers, you are supposed to be able to switch service providers without changing your phone line, but it is not a smooth process. If you are not with eircom, for example, you have to switch back to eircom, lose your broadband, and then wait to be connected to your new service provider. One step forward, two steps back...
Has anyone else noticed though that the service is bit iffy of late - with periods of no connection or very long page loads?