Those that are posting below are referring to a specific shop and not Etsy itself, which is a little unfair. Etsy is a website that effectively allows people to open up their own stores and sell their goods (like Ebay, except it specializes with homemade, crafted products).
I have had so much success with Etsy, purchasing a number of items over the years. Recently, I got to see the other side of Etsy with their case system.
What happens if a store doesn't send you what you pay for? You open up a case. The vendor has 5 days to respond to your case and resolve the issue without Etsy needing to intervene. The shop that I was having problems with did not respond, so I escalated my case.
Etsy then responded that the seller had two additional days to either send me what I purchased or refund me. If not, they said that they would immediately refund me, and shut down their shop until they reimbursed Etsy for their funds. I was blown away by the customer service that Etsy provided and I really do encourage people to keep shopping here.