I've got a 14" tramontina which sees quite a bit of use, I've got two the same as it happens, you want to borrow one at the weekend barney?
I've not used mine for digging holes, but they'll clear brush and split branches (I mean, even a knife'll do that!) the main fault with them is they're not thick enough (4mm would be ideal imho) and the edge doesn't last well, you pay for what you get though I guess.
With practice, they'll cut, sharpen split etc well, you just need to be realistic about what they can and can't do though.