This hammer is an overall solid performer. It has a nice weight and balance; not too heavy or too light. It comes with a hole in the head so you can attach a funkness. The way the webbing attaches to the bottom of the hammer is solid. I have never seen it break. A few other brands use screws for attachment and I have seen these screws come out and send the hammer to the turfit's a bad scene. It happened to Ammon McNeely and me on Rodeo Queen in Zion. This is the most widely available hammer and is pretty easy to find.
The main dislike with this hammer is that it does not have a tip that allows you to place #2 copperheads. It sorta works for #3 copperheads but not as well as a hammer like the old A5 that has a tip that comes down more to a point. Also, without a point, this is not as good at cleaning copperhead placements. In contrast, the Petzl Bongo has a big pick great for cleaning placements (copperheads, nuts or cams). The head is durable, but if you are a big wall addict, you will start to wear down the edges.
Overall, this is a good hammer for climbers that occasionally do a nailing route. And, to be honest, there are not a lot of other hammers out there. If you are doing first ascents or serious nailing routes, it is a little limited. For serous routes I would rather have a hammer that has a heavier head and the option to place #2 copperheads.
This is by no means cheap, but there are not a lot of other options.