I'm an early adopter
Bought a Xiaomi REDMI 1S way back in 2014 online (ebay I think) before they went large internationally.
I always liked it, but I like it even more now after successfully upgrading it from the Chinese version Android OS (sometimes annoying) to Android 4.4.4 (Global version) this week. Unless you are a dedicated phone flash hacker, it is better to buy the international version. Remember that the Chinese market was so big whem Xiaomi came on the scene (over 35 % of the global market) they hardly cared about Western preferences (this is finally changing). They then quickly started to outsell Apple and Samsung in their home market.
The Xiaomi specs are indeed fabulous for the price. Back then, my REDMI cost 149 USD. With 1 G of Ram, 4 G of storage and 1.6 g quad-core processor (qualcomm) it was a serious Android contender. Anything else at that price was "heap steaming cow dung".
As far as buying goes, they are playing the One Plus subscriber game, check http://mi5xiaomi.com/ for info. It doesn't matter, I am sure it will still be a nice phone, based on past performance. If I even wanted a new one, I would definitely be looking at this puppy.
You can also look in grey markets like Ebay. Try to but it with the Global version of the OS or else spend time on forums learning how to flash it so you can stop your keyboard from suddenly shifting into Mandarin. Other than that, nice hardware.
Catchy name too, maybe they'll bring out an NSA model soon.