I cant comment on the 72, but I do own a 12, and it is a great bag....by far the most hard wearing and bombproof bag that I have ever owned.
As the guys are saying, it is heavy and perhaps a bit expensive, but you do get a lot of bag for your money. The build quality and materials are excellent.
I paid about £80 for mine about a year ago, but Im glad I did, because it is still like new and its going to last for years to come.
I use it daily for my work, my gym bag, my bushcraft bag....I basically use it all the time, and there are no signs of any wear and tear as yet.
My Bergen for hillwalking, weekends etc is a karrimor predator 45, but when the time comes to upgrade, renew, whatever.....Ill certainly look at the Rush 72, as I know Ill be getting a good, quality bit of kit.
I only wish they were around when I was in the army, as I would certainly have had one as an ops sack.
Hope this helps,
Allan
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