I just got the Blackhawk a couple days ago and I am very happy with it. It is an older style than the one in the link without the Molle or the bottom zipper.
It was also a third the price of the new one and one 6th the price of an eagle.
Now that everyone has stuck Molle webbing on all their packs it is a great time to find an older model on sale.

You have to be honest with yourself about why you need a pack. I use mine everyday but not very hard. If you want a serious outdoors pack that you can carry a lot of heavy gear day after day then spend the cash and get a top loading Kifaru(or similar quality) with a good padded waist belt and an internal frame. I actually have a civilian pack like that and it is awful for the day to day holding my wallet and books in the car stuff.

The Blackhawk would be horrible for having to haul stuff up a mountain but it is perfect for on my motorbike or being used as luggage. It has good (not excellent but good) stitching and nylon. The buckles aren't the greatest ,they are "kifco"
and I will probably swap them for some excellent Canadian army ones I have hundreds of. The main zipper is huge ,it is not a YKK but it is a good zipper and the design is very well thought out. Other than the sage colour it could be a decent civilain pack.

Now that I think about it it is really just a first rate college bookbag with a hydration sleeve in a "tactical" colour. I can see how someone buying this as a serious assault pack would be disappointed but they probably should not have cheaped out. For a really good military pack you are looking at about 250 to 300$ but I bet if you really shopped around and were not picky about colour or which good brand you could get a really good nonmolle one on clearance for 150$ maybe even a bit less.