From what i have read about the new Augs they are manufactured well. For a close range rifle i really like it. You can get a nato conversion pack for it to use M16 mags for about $400. I wish i hadn't sold mine. The quick change barrels & low recoil is what i liked the most about them.
The sig has the better trigger hands down. It is not as balanced as well for me as the aug was. I currently have it for sale at a local shop so i can fund a build.
Here is a place that has the new Nato Sabre aug & sells parts for all models. They also had a review on the sabre aug there some time ago.