I've seen the Davidson ones before. Mine is slightly better in weight and feel - but still not great!
The blue Japanese (?) one in the forum linked above certainly looks like mine (shape, pattern, thickness) but there is one aspect where there is a big difference. The blue one has a kind of inverted arch giving a nice profile to the sommerso effect. Mine is more like the Davidson one in that it is pretty flat suggesting to me at least a kind of cheapness. Was there any consistency on this matter?