this method may have it's advantage for sure. My biggest concern, and also why it doesn't turn me on, is the precision of your layout alignment when doing a double sided PCB. With transparencies film it's just soooo simple to do.
You place your 2 films on a white sheet (or lightened table if you have any) align them perfectly, stick them together with tape on 3 edge (create a kind of pouch) and VOILA!
Place your film on your exposure gizmo, place your PCB the way you want without having to care about alignment, start neons, few minutes later it's done... on both side!
But yeah... you have to deal with exposure time, chemicals etc... but it's working really well. I did many successful prototype PCB using fine pitch SMD components, i can't confirm if the toner method would work as this well. But as long as it's working for you... life is good 
If you scratch your film, or you use a fine tip ink pencil.. or simply print it again. Make sure you inspect them carefully first.
If you mess the toner transfer, what happen? is this easy to remove? What is the aprox cost of a toner-transfer sheet?
Films can be reuse again and again.
Last edited by mister_e; - 15th April 2007 at 19:53.
Steve
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