Here's my take:
I bought the messenger bag to take with me to a convention where I was live podcasting interviews.
The bag is... well... let's just say there are better. It's not cheaply made, but it's not very well made, either. The flap is awkward, the main pockets are too small for anything but a computer or books, there's no internal organization pouches. The external pockets are awkwardly placed and the zippers are installed in the wrong direction so that they're hard to zip closed with one hand while it's slung over your shoulder.
That being said, this bag saved my life at the convention. The weight of the bag plus the heavy battery pack does balance pretty well, and the fact I could recharge my iPhone after every interview meant that I was not stuck fumbling for juice box after juice box trying to keep the battery life up. It fully charged my iPhone and iPad probably four to six times a day for five days.
I traveled with it to JFK, BOS, SFO and Orlando. I never received any extra scrutiny with TSA.
Caution: Do NOT leave the bag's charger in the hotel room when you leave. It's hell to find another universal device that will work with it because the bag's socket is a weird diameter.
I wouldn't say I think it's the greatest bag ever. I think that the strap loops on the bag are badly designed and will probably bend or break soon. And I think the overall quality of construction is pretty low, considering it's supposed to be a $135 bag. But as a $35 bag, it's a good buy.