AGA Aquariums and MegaFlow Overlflow

[Captainhemo]

I'm looking at a tank upgrade one of these days and was wondering if anyone cares to comment on the quality of All-Glass aquariums in general as well as their Mega Flow Overflow system.
I'd be going to a 75 gallon tank so that tank would come standard with one overflow.
What about the plastic center braces these tanks use , do they really do anything ? It wouldn't be a bow front, just the regular rectangular tank.

Comments ? Experiences ?
Thanks

-jay