Both good comments!
I chose this design for driver visibility looking back with the rear view mirror. The "fastback" design blocked part of the view. Maybe because I am taller than most it is more pronounced with me.
I know exactly what you mean with the sun coming in from behind. I must say however, that unless you are always driving away from the sun, it usually is not a problem, and I am one of those that do not like sun on my head. The other alternative is to get total coverage with the Safari Top. This model goes all the way back to the rear tension bar.
One of the reasons our products are so successful is from comments and great ideas from you the real in the field user. Perhaps we could get some of the "fastback" designs on the market and see how they sell.
Greg