Its ridiculously expensive
Its pretty damn awkward
Its very time consuming
most of all
Its impossible to get a dust free image while trying to juggle all the other things going on.
Here is a wonderful shot i managed to get right a few weeks back in Bristol. Turns out its got some sort of ridiculous piece of hair on the neg.
Sucks, but these are the things that you learn from. Next time i know DUST is even more of a priority than before.
Check the detail of this beast in the second image.