Well damn! Is this a M200 killer (or earphones costing above $150)? I'm not hearing that yet (nowhere close). But does it compete with the likes of the of earphones a $100 or below (or a little higher like the MA750)? Surprisingly - out of the box - HELL YES!! Definitely sounds clearer to me than the MA750 with equal (or more bass), and more extended highs, although not harsh. Mids are full (the whole sound spectrum is full). I happen to have the IM70 with me today. Is it beating the IM70? Not to my ears (the AT is still fuller with a bigger overall sound), but I would be lying if said the Pistons were far behind. They aren't better, but not far behind at this stage.
So, with that stated, if you can be sure you don't have fakes, fellas, this is the best sounding bang-for-the-buck I have heard in 2014 (or should I say first). Yes, this is easy hitting a $100 in sound IEM for $25 I paid for it. If you can get a real one for under $20, that's a steal!! Kudos Xiaomi!!!