I don't see NATS and go, oh I gotta signup... or look for NATS when signing up. I don't think it does anything from an affiliate standpoint. Maybe the pro's and cons if any are for things like the modules for FHG database exports etc... Where I know I can export the data in the form I want, but actually see some NATS using sponsors who dont have this functionality so I guess that makes that point invalid
Also seen many Nats setups that don't offer things like referring tracking that is a neccessity and also I see some nats stats report 1/10th of others, so those are things that turn me off more than turn me on... cuz i start suspecting soemthing when its different everywhere