I adore the few items I've bought from there before. They have a good catalog of items and they have a "What's New" section so that you can keep updated with the latest trends. Having little idea what to buy online, I like how it sorts items by designers/colors so that I can choose easily. Free shipping to Singapore is a plus and it arrives within 3-5 days of ordering.
I only visit Net-A-Porter when I have money to burn since the items there are on the (really) pricier side. The most expensive dress I bought there costed S$700 (retail in Singapore was $1300) and thank god it was just as I was expecting. This is one of my fav online shops for designer clothing and accessories.