Ahaaaaa! - If you look on theire respective websites there are demos of the loops available.
As long as your edit package supports multiple video tracks for compositing they should integrate nicley.
As to how useful they are - it depends on what u wanna use them for. - I've never really liked them. I generally prefer to create my own backgrounds. Saying that there have been a few I've been tempted with but again - I used them as inspiration for my own ones.
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