It is a self hosted solution. As with most self hosted solutions, if you are running any amounts of significant traffic, then you should be running it on its own server.
It works well. It's functional and has been updated. At one point, it was the go-to platform for Newbies because it's free. I used it a short while before moving to CPVLab and then on to BEVO. I then had a custom tracker that out performed all of them. Now I am going to move over to either Voluum, AdsBridge, or maybe even Funnel Flux.
Attention: "role based name" email prefixes such as support, webmaster, info, contact, forum, service, affiliate, admin, traffic, partners, marketing, etc., for our member accounts are not permitted. They are acceptable for a vendor listing, but not for the member email. This is due to bulk email processors scrubbing them for delivery due to extremely high bounce rates. Please apply for membership using a personalized email prefix. Something like email@example.com.
If we discover you signed up with a role based name we will give you only one message to change it. After 3 days your account will be removed if the email is not changed.