The app works terrifically well to solve a big problem for us: we needed a series of telephone interviews, and the audio quality, with the "premium" rate, is remarkably good. Of course the quality depends upon the person being interviewed to be in a quiet location, and theyll sound better if they wear hard-wired ear-buds with a mic integrated on the cord.
The longest interview weve done so far ran 88 minutes, and that was 170 MB (premium quality). The only hitch was at the conclusion of the interview... an alert screen warned that the upload had failed... but actually the file was there on dropbox. The app really has great integration with dropbox.
Its a nice plus to be able to make phone calls from an iPad.
DocuGuy about WeTalk Pro- WiFi Calling Phone, v25.0.1