Bought it on comviq that month's mobile by the end of June and the like after a few months I can say that it is definitely the best phone I had.
My Samsung Galaxy bursting display of quite promptly, but the Xperia X seems to be almost completely unbreakable. Have dropped it lots of times, both in the parquet floor at home as well as outdoors on the plates / asphalt and amazingly enough, it has barely even a scratch on the display. Incredibly solid construction, it seems.
The performance is more than adequate, have not had any problems at all with the game or the like which lagged as the processor / memory seems to be quite enough.
No problem with heat either, which could be a problem earlier on some models.
The battery is more than enough during the day, so then you just have to recharge fully again at night. Would say that it is the same as my previous Galaxy models.
Given the current price around 4000 SEK so I would say that this phone is a bargain.