This unfortunately feels exactly the same as signing up for any other merchant facility. The API might be great, with with wrappers such as ActiveMerchant for Ruby, is that really such a big deal anymore?

No clear pricing, loads of info required to signup, monthly + transaction costs + merchant service fee, and a seemingly apparent affiliation with NAB's multi-currency merchant account.

How is this different from getting eWay, NAB and Chargify? You mention three points, integration, PCI and Support.

I've touched on integration already (ActiveMerchant). PCI - Chargify handles this (as does eWay using the token system).

So really the main point of difference is Support (and perhaps pricing, but can't be sure since it isn't transparent).