Has anyone tried an app called "Whistle Phone?"

[Divya44]

I've used two to three different VOIP apps over the past year and haven't been satisfied for long by any of them. I tried Skype, Textplus and Talkatone but none of them did it for me..too many dropped calls and bad call quality. I just recently downloaded Whistle Phone, and was wondering whether anyone has used it or heard of it before? Is it worth giving a shot?

Thanks!