I have been following Voxeet from its first launch. Considering the last upgrades, I can say I am amazed by the sound quality and its ability to switch from a VoIP connection to a PSTN connection (quite useful in a bad network areas) !
The next step, a web version probably (?), may make the usefulness of the service easier, facilitating multi speakers appointments and talks.
AHVenture about Voxeet Conference Call, v3.5.1