I understand you don't want to waste money on poor logos, so you'd find a seller with money-back guarantee. Yet, some of the best logo designers on Fiverr don't provide such guarantee. Professional logo designers have faith and confidence in themselves, and they think their efforts should be paid. They'll provide limited revisions instead of stating a money-back guarantee. Still, if you'd like to enjoy service with money-back guarantee, you need to pay attention to the wordings used by the sellers. In what cases will they refund? Is it "money-back guarantee with no questions asked" or anything else? You may need to take a screenshot of the description, so it can act as evidence when you need to contact support for refund if the seller rejects your refund request. Contact the seller beforehand if it only states "money-back guarantee" without any explanations. Bear in mind, you'll only get shopping credits to buy another service if you receive a refund, but not real money.