I can't remember the last time I needed a crow bar, even less times I needed a crow bar at the same time I needed a hammer.
If you need to pry up small things, then most hammers are small crowbars already. That is ones with a head like that that is.
The thing does look more fragile than a regular crowbar, that middle joint cant be as strong as a solid one. Also when you bang the hammer does the split in the head cause any kind of weird impact vibration, since its not solid but two parts ? The impact of the hammer head is going to cause some slap against the back part as the energy moves through the head, is that going to be an issue ?
Kinda looks like a scam. I mean the FAQ at the end shows they don't know how much torque it can stand and wont know until they reach their money goal.

Also they say its going to weigh at least 43 ounces. Pretty heavy hammer for all day use.
I'm just trying to find as many things wrong with it as possible.