I like being able to find styles that are different than what is available in the online stores in USA. I LOVE the free shipping and returns, as sizing can sometimes be a challenge. I find ASOS products to be consistent in sizing; some of the other brands offered on their site are trial and error. I've had very good Customer Service experiences; although it is difficult to contact them from outside the UK, I was able to get excellent help via their FB page. I've made purchases and returns and the going was smooth.
Horrible customer service!
I really love ASOS. Shipping and returns is fast and easy plus they always have awesome promo codes available.