I went from Beepers 25 years ago to a bag phone 22 years ago to Nextel 18 years ago and at that time it was like carrying a brick on your side. I still use their service with 6+ phones on the account for the last 18 years. I watched their stock closely "nxtl" but never bought any, then they sold out to sprint. Sprints PTT does not work as well as Nextel's PTT.
BTW you can also text on them, so why not have the PTT? Still no face-time on them yet!