I have a Xiaomi Mi2s and I love it. It works great and is really fast. The reasons I bought it is because it was only 250 euro and just a bit stronger than the Samsung Galaxy S4 (which costs a shitload more). My girlfriend has a Xiaomi RedMi and a friend of mine has just bought the Mi3. They both love their phones and I highly recommend Xiaomi to anyone.
I bought my phone from Ibuygou. To be honest, I bought all of my Xiaomi related products (including a bigger battery and covers) there. I got my phone in 3 days with the DHL delivery option (which does costs a bit more, but is definitely worth it).
EDIT: I have been reading up on the Mi4 and I really like it. Might be my next phone (when it's easier to purchase)