Some day in the not too distant future I hope to treat myself to the 9000 scanner, if I can find one, even B-H does not have them in stock. Anyway, I was hoping someone here could tell me some things about the glass holders. First of all, I assume it should definitely be used for best results? There are two holders, one of which is "rotating". Just what exactly rotates, what benefit is it, and is it worth the extra $100 over the "non-rotating" holder. Here are links to each holder from B-H: the non rotating holder: http://tinyurl.com/2mqs96 the rotating holder: http://tinyurl.com/2s6lr9 Also, why does the description of the holders say "for brownie film" ??? Thanks so much!