Milf, your information seems a little dated... Most, if not all of the XTS3000s have been phased out and replaced with 5000s, I can speak for the crews at station 1, 4, & 5 (and 11 if you count driving by a wreck and seeing a bright yellow XTS5000). They are expecting digital VIPER talkgroups for Asheville & Buncombe County in the next re-programming. I can't say much for APD however I have seen a few XTS2500s & 5000s on their hips when they come by my work.
Asheville just recently added a fourth site at White Fawn Reservoir, just above McCormick Field to increase in-building coverage downtown; their license WNXR226 reflects the new site addition, along with the addition of a vehicular repeater pair. There is talk of an 8CALL/8TAC repeater(s) being installed soon as well, but I have not seen anything pop up in the FCC ULS.
One of the head personnel for VIPER in Buncombe County is a Captain down at AFD Station 4, so I'm sure they're doing just fine with VIPER, as they have been for a while (including a SAR call a few
YEARS ago where VIPER was utilized to keep in contact with Buncombe EOC from Haywood/Jackson County area). There are also patchs/links availiable for the Sheriff's Dept. to VIPER; BCSO-TAC-2 is also patched to APD-MUT-AID fulltime now.
Though it may not be perfect, interoperability (yes I used the big I word) is fairing very well here in Buncombe County, specifically between the city & the county, and provided the county takes the route of AFD and keeps VHF in all of their rigs plus providing patches/links, it should continue to remain that way regardless of going to a fancy 700 MHz digital trunked system, or back to good old low band.
Shoot me a message if you've got any questions and I'll get ya caught up as best I can if you're interested