Sprint's LTE is super fast in Atlanta and built out further than at&turd. They also have the only truly unlimited data plan at an affordable price. Their network works in some places the almighty overpriced "big red" does not in this market- that being said:
the complaints I have heard from one local beverage company who migrated from iDEN to Sprint Direct Connect (the new name for their PTT over cellular product) says it SUCKS. The handsets are total garbage, freeze up, and eat batteries. They are looking at switching to a local MotoTRBO ESMR or NXDN trunked SMR operator in the Atlanta area.
Nextel was once revered for the way they treated business customers, had some of the highest ARPU's in the industry in the "pre smartphone" days of wireless. Once the fad of the "Nextel chirp" wore off from the general public when the smartphone caught their eye, iDEN was on the chopping block in 2004/2005. even with WiDEN the max throughput you could ever get was equivalent to EDGE, and only in ideal conditions.
The "Power Source" hybrid phones was the classic example of an epic Sprint F A I L.
Sprint destroyed Nextel, and they intended to- they wanted- no CRAVED- that valuable 800MHz SMR spectrum. They aren't as dumb as we think. The fact that SoftBank is after them like a stalker pursuing the hottest girl in Hollywood is proof of this.
iDEN is doomed in the USA. Once Southern LINC moves to TETRA, it will only be a matter of time before Motorola ends support for iDEN the way they have ended support for all other "legacy" RPG networks like Smartnet analog, Privacy Plus, etc. AirPeak won't be far behind.
Hytera already has contracts to build out new TETRA networks for two large EMC's in my state. TETRA is here, and it is the new iDEN.