Well all.. Final update.
I have used the radar several times now and 3 being in total darkness coming to and from the boat ramp in northern Tampa bay. I can't say enough about this accessory/technology. Between my plotter and radar screen it really makes it unnecessary to use any type of external light (although I always have my spot light ready). I have found that the most effective range when navigating channels is the 1/8th, 1/4 or 1/2 mile ranges at the fast rotation speed. Channel markers, buoys, hazard markers all show up with separation and are readily identifiable. When dialed up to the higher ranges storms and rain are easily seen out past 15 miles.
Case in point - It really provided assistance in coming back after the Tampa 4th fireworks at night with higher than normal boat traffic and limited visibility due to the rain. I could clearly see boats from all directions whether they were moving or not and of course the navigational aids. I have not tested the more advanced features where you can overlay your navigational line or tracks on the radar screen but I am sure it will only enhance usability.
If you have ever thought about getting one and find yourself out frequently at night/early morning or low vis times I would encourage you to consider it. I know it's not inexpensive but I have found it very functional and most definitely adds a serious element of safety and situational awareness. As always- let me know if you have any ?s
B