I have recently added a Think Tank Street Walker Pro pack to my gear.
I was looking for a bag that would be able to fit all of my gear. I previously used an older Lowepro "sling" style bag which worked ok, but didn't distribute heavy weight well and wasn't able to fit all my gear in. It served it's purpose, but it was time to move on.
I personally like the way that the bag is designed. I researched several different bags in the similar classes and felt that this form factor fit what I wanted best. It is very deep but narrow. This is nice because it doesn't feel all that big and I am not always hitting my bag against stuff when I'm out in the field. I enjoy wildlife photography, so this is a nice feature. I also like that I am able to fit the bag into carry-on if I desire to. I was comparing this bag to the similar LowePro options, and I would have had to go with a larger bag to fit the same amount of gear which sealed my decision for this one.
Fit and finish is very nice and it seems like the designers really put their time in making this bag work for photographers. The dividers are easily removable and I actually like the thinner dividers since it allows more gear to be stored in a smaller space. I noticed that some of the other manufacturers have thicker dividers. The bag is also very deep, which allows lenses up to around 6.5" to be "stood up" rather than laying down flat. I also really like the back padding that is available and it allows nice air flow, which is a bonus here in South Florida.
I ended up going to an actual photo store and trying several bags out to see what the best fit would be. I would recommend this, because many of the bags are very similar and I had to try out a few to pick my favorite. You can't really go wrong with most of your main manufacturers from what I've seen. If this bag meets your shooting needs I would strongly recommend taking a look at it.