Not sure if this has changed with more recent models, but I've had rather bad experiences with UX31.

Although the model number was the same, most of the European variants had a different, extraordinarily bad SSD, which slowed down to <1 MB/s if the file system was something like >70% full.

Other indicators of bad quality:

- keycap texts disappeared for the most used keyboard buttons after just a month's use

- crashed once every three days on average (hardware issues?)

- The fan makes a buzzing sound as it scrapes the bottom of the laptop casing

- The screen died after about a year of use (booting up makes the screen gradually turn completely white within 5 or 10 seconds)

same here. I've bought this year i7 1.8GhZ four-core machine, 12GB RAM, 128GB SSD and installed ElementaryOS on it. It works like a charm - especially for someone who switched back from MacBook with OSX to Linux machine. The author mentioned that he won't be able to replace OSX by linux emotionally - You should check elementaryOS - some people think that it just a OSX rip-off (but it's not)

I have a Zenbook Infinity and yes, it is good, but the battery life is too bad. On linux it lasts 3 hours or less with the OnDemand governor, whilst on windows it last 4 o 5 hours.

I don't know what to do to improve battery life :(. I regret not buying a Macbook Air for the same money instead.