You don't get a refund because of your payment method - you get a refund because of consumer protection law.
Companies that think they can get away with not giving refunds because people have paid with bitcoin will find that what happened to Butterflylabs happens to them.
Consumer protection law is what matters here - not your payment method. Most times you want to get a refund/take something back you talk directly to the retailer and they refund you directly or give you store credit. You only go to the credit card that one time in a hundred when that doesn't work.