CDN Hosting service?

Hi guys,

I'm trying to figure out how set up a new CDN hosting service in terms of features, pricing and all other details. Would you please tell me (I'm asking site owners, because web hoisters look at CND from different perspective) what would you need from a CDN. Is it just the fast loading web pages on a browser or also an improved security?

I appreciate your comments!

PS: Fellow web hoisters might share their experience with CDN networks and the price of the CDN bandwidth!?