The jack is of very poor quality, plus BIOS problems.
The jack died after 2 months of use. I had it repaired, and the new jack died after 4 months. This has never happened to me with any other electronic device.
On top of that, BIOS problems mean that standby doesn't work. Bluetooth doesn't work either, probably because of firmware problems.
The fans are noisy and the computer heats up a lot despite this.