One of our site uses it
OneManBanned.tv
Pros:
Surfers can download full scenes at high quality - no joining files needed.
They can "buy" individual scenes or buy a monthly membership.
Our content is protected and if they end up on Kazza, then its a bonus for us
Member retention is good as the files will only play while the surfer is an "active" member.
Theres also a shit load of rules
you can set of how you want your set up to work.
We are hopefully soon going to add all the movies from our network into a new PPV site. The surfer then can choose what he/she wants to view. If they like a certain niche, they may join the members site already running. Think of it as a "try before you buy a full membership". (IE: the surfer can buy and download a few films of there choice for a few Dollars before commiting to a monthly membership. In doing this we get more revenue).
Cons:
Having a site using the token model and a normal monthly membership means encoding the the same file twice and uploading twice.
The files don't work on Macs.
Some surfers don't like DRM, but hey, it works for us
