I have the 901 chest rig with back panel. I chose the double stanag mag pouch with closure flap because they easily accommodate my m14 mags as well (single only though). The material and manufacturing is beyond reproach. Adjustability seems to be almost limitless and I'm 6'3" 220 lbs with a 34" waist and have the thing cinched close to the max. Meaning a heftier fella will have no issues at all. I will be getting to a full review with pics as soon as life gives me a breath so stand by.
The option of running this as a plate carrier when combined with the back panel or a chest rig is a nice feature.