Allow me to introduce, I switched over from Leica M240 I am very happy with EM1 - the size and the performance I get. EM1, IMHO, is one of the best camera you can get and the lens (12-40; 40-150 and 75) are so good that I am very happy with my system.
Buy the parallel import, the price is reasonable. One recommendation to all EM1 user - you can consider to buy the base plate (made by Really Right Stuff) to improve the holding of the camera. The battery grip is way too big and it makes EM1 too big. You can get a Chinese copy (RMB100+) on TaoBao. I had one, can't be more happy about this decision. It makes the EM1 so much better to hold, although adding just a bit of weight to it! Enjoy, this is a good advice you won't regret it.
As to shortcoming of EM1 - I think, too many control available to user! Haha.