If you have your own group of people that will move with you, the answer is yes, it works and is better than Nextel, since they have a reliable network compared to Nextel direct-connect.
There plans are only $5 additional per phones for unlimitted PTT and they wave the $25 activation fee when you buy a phone.
These phones use the latest CDMA technology Data Only Revision A (DORA), so the initial PTT call set up time is just as good as Nextel.
The other advantage is that Verizon has a web portal to update your contact info and has presence info. on the phones (similar to any chat service) and it is nationwide coverage.