I won't use a cashier's check, simply because I've never seen nor used one before. If the buyer really insists, then I'll go with the buyer to the bank and cash

I won't use a cashier's check, simply because I've never seen nor used one before. If the buyer really insists, then I'll go with the buyer to the bank and cash or deposit it before giving them the product to make sure it's not a fake piece of paper.