Ah, a prompt and excellent response. Thank you.

Now... hmm... this is the part where I think I may be running the risk of coming across as a poo-poo head.
But I do feel the need to point out that Visa does indeed offer
revolving debt products, and without looking into their numbers, I currently can't imagine their default risks any higher or lower than Mastercard.
However, I do have to disagree about American Express being a higher default risk. American Express' core business has always been the charge cards, and it's typically held by clientele that are a lot more financially stable. The credit offerings are a more recent development and their royalty system is still closed last time I looked.
That said, I do agree about much of what you said, especially going long and buying on dips. I think I'll maintain a "wait and see" approach on V, but I think I've rained enough on people's parade on this one. Here's to hoping that it continues to prosper for you guys.
