Not even a tiny little bit. As for architecture, if you are photographing buildings which are perfectly plumb and level, you can spend a lot of time leveling the camera to match the building - you'll have to go over the building first of course, to be certain it's plumb and level. Or you can spend a few extra seconds lining things up with the grid on the GG - the results will be indistinguishable, and if the building isn't plumb and level, the levels on the camera are worse than useless, so you'll have to learn to use a grid anyway. Paint the things black and forget about them.
Originally Posted by analoguey