Bulk Film Pro:
Easy to make custom lengths of film (I usually only made 36-exposure rolls)
Buying film in bulk may reduce cost per roll (especially when shooting color)
Able to load film in scratch resistant felt-free cassettes (I used Nikon AM-1 cassettes)
Able to load film in cassettes that reduced friction for better motor drive performance
Can be used when traveling to countries that limit the number of rolls brought into the country
Bulk Film Con:
Long leader wastes film
Long trailer wastes film
100 feet of desired film is not always readily available
Must decide if plastic or metal cassettes work better
Must decide of felt or felt-free cassettes work better
Must decide if snap-on or screw-on cassette tops work better
Big financial loss when a 100-feet of film is accidentally exposed to light
Burke & James Watson model 100 bulk film loader by
Narsuitus, on Flickr