This is a great alternative to calling cards. We used to buy the cheapest calling cards we could find. We have to change pin every month or so, and quality of the call varies depends on the provider of the card. Sometime we don't even know how we could used up so many minutes so fast when there is not log to track your usage.
Onesuite is awesome. It got so many features: no pin, no connection fee, full calls log and usage. The best part is the rate is as low as the cheapest calling cards we bought and great voice quality. Now with the addition of VoIP feature, Onesuite has added ways to like them even more.