I have been getting inconsistent results from bevel setting on 15um film mostly because it is very stiff and has a curl to the film making it difficult to keep flat. The 12um film just wears out to quickly on some of the questionable blades I've been working on. So I "need" a good bevel setter. I've narrowed the choices down to the Chosera, the Naniwa SS or Superior, and the Shapton Glass. I understand that the consensus is that the Chosera is the best, but is it that much better than the Naniwa or Shapton for someone who does restores in the 10's instead of the 100's? I hate to spend $100 if $40 will work nearly as well, but I loath spending $40 just to find out that I should have spent the $100 in the first place.