I've only done one, 'test', flight with the 721, around Denver, Colorado since just purchasing it the other night. However, most of my flights (that will be including the 721) are roughly 1 hour flights anywhere in the states.

Thats also where all my scenery addons are to. ;)

I'm sure the 707 will be my next purchase down the road and I'll have to just dive in feet first learning the civa-INS.