I finally got a demo. So far after less than a day I really like it, my biggest gripe is they don't yet have an RSM with a channel select knob. However the current RSM is pretty cool, quite rugged and should be easy to use with gloves. The radio itself seems quite rugged as well, as others have mentioned the P25 audio is phenomenal. They did a fabulous job there.
I also love the three line main display, you can (for example) set the bottom line to always display what site alias your on. Mine currently alternates between UID and site alias which is cool. Also the big LED at the top is pretty cool, it shows green on RX and Red on TX.
Quite interestingly, the RES software has a total firewall between the core Trunking system settings and everything else. From the little I've played with it, it appears you can adjust pretty much all the buttons, knobs, display and menu settings for BOTH Trunking and conventional without a system key. Just the main Trunking system settings are all greyed out (global settings, control channels, talkgroups, site alias table etc.). And, you can make any changes you want on the conventional side.
From what I can tell they decided to include less options overall for Trunking, for example RES has no options to modify RSSI thresholds like you can with Harris or Moto (if I'm missing something, someone please correct me). Apparently that's all hard coded in the firmware or something. I'd be curious to know why, maybe the engineers felt most people who modify those settings from the default values don't know what they were doing.