I'm getting tired of lugging around my 35mm to use as a spot meter. I've done some searching online, and I think I want to go with a used Pentax Zone VI modified spot meter. But of course I am having second thoughts about buying used. I searched Audorama and see that they have a store brand spot meter. Has anyone used this meter? What do you think of it? Also, is the Zone VI mod worth the extra cash on the pentax meter?