I am well informed in advance of purchase and read only positive of the IEMs, but made a completely different experience for a few hours. The headphones fit from the outset not right in my ears. The material of the standard fittings feels uncomfortable "dry" and they are too short to functionally to support the peg, so much of the sound can escape. The sound quality was surprisingly good even without burn-in, especially the basses are accurate and active. The essays I would have changed, because every ear is different, and the price / performance ratio appears very attractive in terms of sound quality - I did not just get an electric shock in my right ear! I had connected the headphones to my laptop and initially felt an uncomfortable tingling, then an electric shock in the right ear. Pretty ungechillt. It is possible that this is a very rare production error because at HiFi products always a scattering of quality achieved is present - in which case I just had bad luck - but nonetheless, my impression of the Piston is quite negative. In conclusion, I would recommend this product to anyone and therefore advise against a purchase.
