The Asus UX31LA has a better storage medium than most medium processor core notebook PCs that came out around the same time as it. This notebook PC has an SSD storage medium, whereas most notebook PCs of a similar type and age to it have an HDD storage medium. Solid State Drives (SSD) store data in semiconductors on a circuit board rather than using magnetic or optical media. Solid State Drives have no moving parts which makes them very fast and reliable.
This notebook PC's storage medium (SSD) is actually the best storage medium across all medium processor core notebook PCs that have been available for a comparable time to the UX31LA.
Across similar types of notebook PC the worst storage medium is HDD.
If the storage medium of this medium processor core notebook PC is too bad for you then you might also want to look at the T420s[pl_48433_price] (SSD), or the S540[pl_2433540_price] (SSD) both from Lenovo.