Been using it for the past 4 months. No regrets so far.
Very light, completely silent, amazing battery life when simple surfing and browsing pdf files (can get 10 hours). In the 4 months, I have never entered hibernation mode, because the battery doesnt have the chance to drop so low before.
CPu performance is not strong, but the SSD is really fast, which makes up for loading times. It is best used in aircon room, as the metal can heat up to become painfully hot in room temp.
My model is the 4gb, 5y10 model. Because it is the slowest core M model, the heat produced is lower than the highest end 5y71 model.
http://www.anandtech.com/show/9117/analyzing-intel-core-m-performance
I dont notice any drop in performance even when things get hot.
Build quality has held up. Hinge and everything no problem so far.
Overall my stand remains the same (check the second post of this thread). It is good for simple productivity. No go for gaming, x265 video play back.