I pre-ordered one and was trying to forget about it, but now I'm all excited again to get that sucker. I'm hoping it's in for my vacation in October, and will try to give it a quick run in the Smokies as a test. Looks though I won't see it for a few months still.
OP, you don't necessarily have to purchase a topo map card. You can download many for free direct from here that are GPS compatible:
GPSFileDepot - Free Custom Garmin Maps, Ximage hosting, tutorials, articles and more for your GPSr
They also have many current land use maps if you're running the public/private land gambit, but those typically have a fee for purchase.