I purchased this ASUS Zenbook UX305FA-ASM1 a week ago, and nothing is a major con about this laptop. If you read the specs, all speak for themselves, it runs fast and very responsive.
Prices changes everyday, got it best on this place.
After using this ux305fa-asm1 for a while, these are my thoughts.
The minor negatives
The RAM is soldered to motherboard, which means, not upgradeable.