I like mytheresa.com for their selection and availability. They carry a wide range of styles and their size range, specially for shoes, is better than NET-A-PORTER. Their customer service is excellent also. I get responses and returns are processed quickly. I also receive my orders quickly (w/in 3 days of ordering). I am in the US, by the way, which is relevant for my next point.
My only issue is their shipping cost (45 Euros). It's quite expensive: probably because of the really nice packaging. (I wish they would give customers the option as it currently doesn't seem ecofriendly.) And depending on the price of your item, DHL may charge you for customs fees as mytheresa doesn't ship duty paid. These shipping companies charge for customs and their services, so you generally get overcharged. For this reason, if I see the same item at NAP UK for a similar price, I would rather get it from them. That being said, mytheresa.com usually has better prices than NAP.
I've really wanted to buy something from them but the shipping charges are exorbitant - to Australia, over 80 Euros~!!!!!!!!! That makes it totally unworthwhile. No one else I have ordered from charges anywhere NEAR that.
I am from Germany!
This online store for authentic stuff is the best I have ever found in the internet! great service and great products!
I bought Jil Sander Ankle boots there! there is nothing negative about this site.