Pros: Very cost effective. Better yet, you can program their number into the rapid dial of your cell phone and avoid staggering long distance charges on your cell phone. This is a good solution for cell phone users who call internationally.
Cons: Occasionally is busy. Long and tedious process to have credit checked and be activated. My, very similar, Canadian based dial-around company does it in moments on the phone not three or four days, if not longer...
Summary: This is a very good service if you need long distance, especially off of your cell phone.