I think there's a LOT of user error going on with this, probably in the field and in the center. I use the CPD system at work, with both APX and XTS in multiple sites within the county. The only issue we've had is when some of our officers are near a county tower, the radios hunt for a city tower, even if it has worse coverage. Motorola is already changing our roaming profile, so once they get done with CPD, we'll get that loaded.
The big issue I hear from CPD officers is that they get busy signals a lot, which is not a flaw, its the simple fact that exists in radio. In heated situations, this means that as every officer wants to talk, and only one can. There's a little change in how this works when the console is transmitting, in the past a portable could talk over the console (only the dispatcher would hear though), but the new system doesn't do this, I don't think its a limitation, but a choice someone made. There's also a change to the CPD dispatcher's emergency activation tones, as these come over every headset in the center, and they can't hear anything else over that. Again, a choice someone made.
The only real difference we've seen with the switch over is that the APX noise canceling starts out super loud if someone yells into the mic, and then quiets a little. All still clear, just a difference in volume.
I've seen a lot of officers cup their mics when using them, and from talking with the Motorola people, this can cause the noise canceling to go nuts. I do know that we have officers that use a different mic than the PSM that was supplied, and their audio sounds WORSE than the Mototrola one, They're using motorcycle helmet systems without noise canceling, from Setcom, not a knock off.
When the city went to the XTS5000s there was training for everyone, I can't remember if it was 1 or 2 hours, but it went over literally every function of the radio. This didn't happen with the APX switch and I think it would have made a huge difference in the complaints.