I recently purchased the international calling PIN from IDOCALL that was advertised in the sajha.com. They were offering $2 discount on their $10 calling PINs, so it was a good buy. It was my first experience with IDOCALL.
The voice quality was excellent. I could connect to international number without any difficulty. However, the line kept on disconnecting throughout the conversation. I had to call three times just to speak for about six minutes. This was a real hassle.
I don't know if mine is an isolated case. As a customer, I'd definitely like to see some improvement in that aspect. Besides that, I think IDOCALL is good.