It might be pretty heavy, looks like a lot of metal and a long handle. It may be a good tool, for home or a vehicle, not for backpacking of course.
The Amazon reviews are such BS, it's as if they haven't really used it, or just got it, but still haven't used it. Of course, the theoretical zombie slayer would love it, cause it does everything!
Even if it's made well, it's going to be a compromise of each tool. It's never going to be the best hatchet, the best hammer, prybar, etc.. For the purpose of stashing it in your car, and some occasional use, yeah, might be great to have it instead of 5 other tools.