I've had the Geovid HDs for a couple years now and I don't know that I can ever go back. I've kept my SLCs, but even though they're slightly crisper (you have to look trough both at the same time to be able to tell), I still like knowing how far things are, so I just end up letting my buddies use the SLCs.
Some day (hunting gods willing), I'm going to spot that 200" buck at 479 yards, and it's going to be sweet knowing exactly how high I need to hold.