Saw a G-pack hanging on a hook at EMS in Lake Placid and noticed that the haul loop was ripping out because of the weight of all the light filling stuffed in the pack to make it look full.
Also, I have a friend that has a G-pack that she uses as a daypack. She goes out just about every weekend for a 12-16 mile dayhike. She likes the pack, but the fabric has torn from normal rock contact. Last time out she was using her old pack.
I think it would be okay for a few to ultralight backpack trips a year, but it definitely is not robust. That is coming from someone that thinks highly of Gregory packs. I would expect it to last maybe 50-100 days as compared to their regular packs that would last about 300-400 days. Of course you can always get double the life with repairs... and Gregory has excellent customer service with repair work.