I want to point you to a small review I found at Tech Republic :
The overall criticism is positive: the reviewer is enthousiastic about your software. The one reservation he has is about GPT and I quote:
"Really, the only downside I've noticed is the lack of support for machines with the next generation Extensible Firmware Architecture setup and GPT volumes. Because GAG is GPT-unaware, GAG won't be able to detect volumes set up in that layout mode. Your best option at this point is to consider using GRUB instead. "
Is there a chance you will be able to support GPT in the future?