For the City of San DIego 700MHz Phase 1 system, the XT scanners are barely able to receive the system, and in many many places, such as near my TV station, they will not even be able to lock onto the control channel with maximum signal.
As for the RCS, they are NOT fully Phase 2 yet. Right now, for public safety, only Escondido FD is fully Phase 2 (unless an outside mutual older model radio comes up for a call), with blips of Phase 2 on Sheriffs tacticals at 2AM and maybe like the Medical Examiner.
I have found the XT's prefer the 800MHz RCS to the 700MHz SD City system, probably because 700 has so much more 4G LTE interference.
Paul