I too bought the download after seeing this thread. I took my Garmin Nuvi 650 out for a test drive during the day this weekend and it did what I expected - told me where I was and showed me the appropriate markers. During the day I don't have a need for it, but if I'm out at night this should be a great added thing to have in the boat.
The one issue is the depth lines and the recommended navigation lines can be confusing. I don't plan on using the GPS for my course, but it would be nice to have the recommended course and markers without the depth. Choosing a lower level of detail gets rid of the depth lines but also gets rid of the markers and course line - not a great trade off.
I only put it through one accuracy test - navigating through the graveyard. The recommended course line went perfectly through the gauntlet.
It's not a perfect solution, but for $10 it pretty much does what I need and that's all I can ask for.
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