As the owner of on occasionally flaky kx155, I'm the target market for this. It looks a lot nicer than the gnc255 for about the same money, and I'm glad to see BK making an effort.
While the idea of reusing trays and connectors seems great, when my 155 gives trouble, I can usually fix it by sliding it out and back in again, which leads me to believe most of my issues are actually with the connectors. That card- edge connector back there and all the wiring connected to it are 40 years old. Maybe replacing all that stuff isn't a bad idea. I do wonder if thats why garmin made the choice to change the trays when they designed the gtn's... to force a new install.
Same as everyone else here though, I have a real hard time spending 5k on a navcom that I rarely use.