Another bit of real-world data, current as of 12-15-2012:

One of our local new-car dealerships in LA County (a fairly large outfit, sells 400-600 cars per month, services an average of 3,000 cars per month, runs three courtesy shuttles and four parts-chaser trucks) has used Nextel iDEN PTT for years, very happily. They began trying the new Sprint Direct Connect as of a couple of months ago, in anticipation of iDEN's demise in June. Suffice it to say, they have nothing good to say about their SDC experience so far, and they are dreading the upcoming iDEN shutdown. They don't like the Kyocera phones (their ancient Moto i335's still serve them well, better than the new Kyoceras), their PTT coverage with SDC is inferior to the now-reduced iDEN PTT coverage, and building penetration with SDC PTT is inferior to iDEN PTT. I have spoken to a few techs & drivers in the field, as well as some of the managers inside the offices, none of them like the new SDC.