I'm using RAP and I'm pleased with the results.

There are some very snazzy add-on plugin thingies that allow your affiliates to promote one product and then get paid for every additional product their lead buys as he moves through your funnel.

All on instantly paid Paypal commissions too.

It takes a bit of setting up, although as far as I'm aware it's all 'out of the box' stuff with little or no additional coding.

I'm still tracking and testing but I like what I see already.

Cheers

Tony