I'm intrigued, because I may get one of these.
Do you find that display usable? It's hard for me to see how it works exactly. It kind of looks like you're gettings swarmed by little rings.... "Hard to star/port??"
They're a pretty good bang for the buck, IMHO... Why anyone wouldn't spend the few extra bucks for what is already a very good VHF to have AIS receive, is a mystery to me... Greatest enhancement to offshore safety and collision avoidance since the advent of radar, in my opinion, now available at a very reasonable cost...
Whether the display is "usable" is a relative term to some, I suppose... In a place like NY harbor, that screen can get a bit cluttered, but of course you can adjust the range to suit the situation. By selecting a target, it will give you range, bearing, speed and course of the target, usually its identity, CPA and time of CPA... The one thing it will NOT tell you is whether the target will pass ahead or astern of you, you have to determine that yourself...
Of course, for many of today's voyagers, that is a major failing of these types of units, they want to be able to SEE that on their plotter display, and have it figure that out for them :-)
There are ways to figure that out for yourself, of course... These things can actually be sort of fun to play with, but I suspect many out there today don't have a clue what they are :-)
Ahhh, wait - the day is saved...
Of course, there's an app for that :-)