The Core

OSM has been around long enough to trust it when building content. When I first heard of it some years ago, it was sketchy.  I think the general concern that Big G is taking over the world has served to push more development.

>forget

I suspect a lot of people have. G Maps blocks out the sun now.  But for developers, the G api key limits were too limited for, say, a broad, popular resort network.  And GM leads your traffic off-site.

*IF* you're using OSM at the street address level rather than a mile-high 'general info' view, I'd suggest spot-checking the important addresses. There used to be some holes --though I suspect they're filled in by now.