(edit: I typed this over too long a period of time, and some of this post appeared after I had already submitted a draft with the above paragraph that received some upvotes, so I've now edited again to add this edit paragraph to explain that everything after this point was added after I received said upvotes. ;P)
Also, I'm very curious about their API... I didn't see much information on chargebacks. Processors like Litle & Co make it very easy to fully automate the chargeback representment flow. PayPal, incidentally, does /not/ provide this either, but they do have APIs that let you (with only some hoops to get through bugs that I've filed with them, and we may see fixed fairly soon) correlate and track all of the chargebacks and how they relate to your transactions.
Yet, when Stripe first started appearing on Hacker News, their website seemed to have almost no information on chargebacks. I asked after this, and the page "appeared" with an apology that it was supposedly there but not linked, but it then had very little information on it. I still (checking again now) see no information on how I'd determine /which/ transactions had chargebacks automatically: they seem to seriously rely on sending an e-mail? Why does their API page never once mention the word "chargeback"?