Ive written a somewhat extensive review here: https://www.reddit.com/r/pcmasterrace/comments/5eoooa/xtz_earphones12_review/

The Earphone 12 is a pleasure to listen to. Voices are clearly understood and the frequency spectre is impressively good. These earphones sound extremely natural and keep inviting me to listen more and more. Want to enjoy music to the fullest then listen to an earphone 12 !

The product shipped and arrived really quick. It came well protected and the package is what you except the earphones SML ear tips. It would be nice to include comply foam tips and a carry case. You also get a airplane adapter and 6.3mm to 3.5mm adapter. I bought this earphones to listen to music when out of home with my smarthpone. I didnt want to spend too much on a DAP and IEMs. So I decided to give this IEMs a try and the Android app with the DSP. When i first plug them in on my smartphone i wasnt blown away however i wasnt expecting to be with a 70 euro earphone. But when i turned in the DSP and adjusted the EQ they just came to life. Bass extension became a lot better without blowing the rest of the frequency response. The mids and vocals became more prominent. The highs became less harsh. Basicaly the frequency response became as advertised. Without the DSP they dont have much bass presence and the highs can be a bit harsh. However when you buy these it is to take advantage of the free app and with it they really deliver good sound. I dont have much to compare. I have a pair of philips SHE3590 that are very good for 10 bucks but get blown away by these earphone 12. And i have the Fidelio X2. Compared to these headphones they have less soundstage and the bass is not as pleasing But these headphones are 300 bucks and they are open back. I really doubt that for 70 euro i could get better sounding earphones than these ones. For a further revision include more eartips like double flange ear tips and comply a case and make them more comfortable. They are not uncomfortable by any means but for long periods of listening can be a little bit. Altought this kind of earphone are not designed for long using periods All in all Im pleased with the way they sound and for what XTZ achived here for this price point. And to take with me everywhere they just do their job right.