Well I tried the Tiger card and the voice quality is impressive much better than Skype to a Philippine mobile.
The system is a bit confusing though, if you call the 0800 access number the actual rate you get is higher, it does state this on site and it does make sense as it costs them to provide an 0800 number, so it's important to use the London direct number to get the advertised rate.
The second point that was the confusing bit for me was that the automated call system states I have 20 pounds credit, I think it means 20 dollars as that is the amount I paid
Good service the voice quality is superb.
Jim