A couple items:
1. This thing is huge. You can fit all your camping supplies in here (short of an RV).
2. It seems fairly sturdy.  As long as you don't abuse it you'll be fine. Although, if you get into a tangle with a grizzly bear, it will probably sustain some damage. My view of those who said their backpack broke either got a faulty one (it could happen) or are the Hulk.
3. For the price, you'll almost never find a better deal; maybe on Craigslist or at a yard sale, but I doubt it.