Well?, I just picked up a new Z5 with a thumbhole stock.
Why? - I do not really know other than I thought it was a great buy...
What are you goning to do with it? I really do not know...
I never thought I would like a thumbhole but I kinda like it. The forearm has a large dovetail that really makes it easy to hold. It would take some getting use to - getting into the thumbhole.
It really seems light as compared to my SS model.
I am really in deep trouble - but it was a good buy...