Hey! You should know that Asus has released a newer version of this product: the ASUS Zenbook UX305FA-ASM1 13.3-Inch Ultra-Slim Aluminum Laptop, 8 GB RAM and 256 GB SSD.
ASUS Zenbook UX31 is a very good laptop. It is comparable to Apple's MackBook Air. Nice slick modern design, fast, portable, high resolution display, very good audio, almost 8 hours battery life.