We switched to Stripe from Paypal and Google Checkout a month ago and so far I've been very, very pleased. I plan to do a writeup of why we switched soon - wanted a bit more results first. FYI, Stripe launched a new web interface 2 days ago.

The net bottom line was this: 1. our customers (business people who are not super tech savvy) just don't understand that you can pay with a credit card on paypal and google checkout requires a google account 2. the "go off and pay" somewhere else and come back to the main site is messy

I have no real complaints with paypal over the years we used them so I can't bash them but I found that over time, we lost sales because people were confused. Now there is no more confusion - fill in a few fields and instantly you are done.

We also considered Braintree which I was also impressed with but decided on Stripe because of the non-need for a merchant account.

I am happy to answer any questions here or privately if needed.