GMG "flimsy"? I wouldn't want anyone to drop mine on me from a height, I cant compare it to the other one you have mentioned as never felt one but flimsy is a touch rude.......
They have become increasingly popular and as ABBQ brings there shipment in infrequently by seafreight I am guessing this could be the problem. If you have the loot then buy the best you can afford, I have been delighted with my purchase and it has done everything I have asked of it so personally not sure what I would get by spending extra, plus the Mrs would kill me as promised the GMG was the final purchase
Also if you choose to deal with ABBQ pick up the phone as they are not the best if you work by eMail, service is good but you have to talk to them to get it to happen
Cheers
Tiny