I do, they are the only ones that I trust now, I have never had a problem with them at all and I buy alot of minutes. Usually by the time I have finished paying the email has already came to my inbox with my pin number. I know i could go elsewhere and save 15˘ but to me it's not worth the hassle when this works so well.
I also use them and there service is great there pins come fast and also I would have forgotten to refill my minutes last month but they sent me a reminder (through email) anyways I would highly recommend them.
babblebug may call the first time you use sign up to confirm. But if you dont change anything on your account, from then on it is pretty fast getting your pin, all automatic. It is the only place I buy my cards.
They do work fine, I like them. But they charged an extra 0.35cents for the $10 card for a "processing fee"... Babblebug did require a verification call for me.
I now use Callingmart, which seems to have the cheapest prices. They use PayPal, and I have also received instant PINs, but I've heard that they sometimes call back for verification.
As of todays date I have bought around 5 PINs from Callingmart. the PINs arrive almost imediately after I pay for them. They gave me a call back the first time I bought a pin off them to verify my account information. I'm very happy with there prices and their service. I would recomend them.