Depending on which country you're in and which bank you're with, chargebacks are nothing like as straightforward as they used to be. I just completed yet another one, which involved 2 separate phone calls totalling over an hour (so probably not worth it on a $/hour basis), accepting the risk that if Visa rejects the claim I'm liable for a further $50 charge (this is new), and generally 3 months of hassle until I got most of the money back (less the international transaction fee, as the merchant had fraudulently claimed to be in the same country as me, but charged me from the UK).