Yeah these are super trendy right now and pretty much part of the hipster dress code, but you can't argue against it's classic style.  Initially I ordered the 52mm based on the previous reviews, but those were too small.  The return process was very easy through Amazon.  Got the 55's and those fit very well.  I bought the tortoise shell and had some concerns about it's authenticity.  I noticed when I held it up to the light, it didn't have any metal support running through the temples.  I went into Sunglass Hut to compare, and their model was exactly the same.  So after my online research and comparing them in person, I'm very confident that these are authentic with a great price to boot.