I think that's a good service for providers that need a certain level of reliability and clear voice in a variety of locations. Hell, I use tracfone/straight talk with the bring your own device in real life.  

But for a hoybbist that only needs text and a few mins. I think 500 free text, 500mb free data, and 200 free voice per month is good for most. Yeah, voice over ip can be kinda low quality on 3g....But on wifi, on wimax, and on LTE are legit.