Also worth is a look is CheapChat.ie, i use them all the time and never had a problem or found anything cheaper.
I used telesavers before but thought their misleading prices on the meteor network was a bit cheeky (1520 is 3c more per min then they claim - its a small issue i know but i like honesty).
Telestunt rang me at home saying they had a promotional offer for "good customers" and wanted my address to post details out - didnt like it when I refused - anyone else get this call?