Redirects are a good idea. Redirects mean that you don't have to juggle legally sensitive credit card data yourself, and your customers see a browser indication that they are talking to the genuine Paypal (or whomever).
Paypal sucks, blocks your account and keeps your money on the least excuse, and is a bureaucratic hell, those are good reasons to not use them. Redirects aren't, IMO.
You don't need to choose between safety and no redirects. One of the major points of the article is that you can not touch the credit card data yourself, AND still get a 100% uninterrupted payment experience for the user.
Again, it's still early, but we are seeing better conversion rates so far. The PayPal redirect gave some of our less technical users fits.
Paypal sucks, blocks your account and keeps your money on the least excuse, and is a bureaucratic hell, those are good reasons to not use them. Redirects aren't, IMO.