To start from scratch doesn't sound good if you ask me. It's like a dupescript where the db has to be built up from scratch.
Okay it eventually searches from that list... What happens if a dir is deleted/moved/renamed etc.? Does it update the list?
I personally like ioA's way of searching. It actually 'searches' - not like a dupeDB. New ioA can search from a list too. There is an option to enable that feature. It scans through the search paths once and builds a complete list to search from. It very fast (too). Only con is list (currently) has to be re-built every N hours or mins from scheduler (or manually) to be updated. But still huge performance gain on VERY BIG sites.
Just my two cents.
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