Paypal Payments Advanced started in May 2012 I believe, so it's still fairly new. Basically, it's benefit is that it's embeddable code allows users to stay on your website when checking out with their credit card. The form technically is still directing through paypal, so there is not need to maintain the PCI compliance or PA-DSS or get an SSL (as you would need with paypal pro). It's better than standard obviously, because rather than be re-directed to paypal (of which will also not look like your site), with paypal advanced you can really make it look the same. Paypal is only charging $5/month for this as opposed to the $30/mo for pro + $30/mo for recurring billing. The question is - can amember work with paypal advanced !? And ideally, users would checkout first, and then be directed to the amember username and password creation page.