I recommend them hands down, having worked for Meteor and personally being sick of not being able to get a call out of a Saturday Night i move back to o2, then i had to put up with the call charges and move to three on there 600minutes for 60euro tariff, havn't had any issues bar one or two dropped calls, i joined them the week they released here and i won't be going back,
I used them in Sweden before and as soon i heard they were comming i was onbaord plus you can always watch the news on your mobile for Free.