Cons: Size of sounds are small. Acoustic of instruments are limited. Treble quality and detail level are below average. Even the bass is not complete
i know you already saw all the threads, reviews, comments speaking about the sweet and cheapness of this earphone (eartrash actually). i also know that there's a common talk about it's fakes, which makes you think that if you can get the genuine one it'll be the perfect earphone of the stars... there's also a talk about it's "beryllium" that you don't even know what it means. i know all of this making you wonder this item more and more...
i know you want all of this turn out to be true... you want a cheap earphone that beats the rest of them. but for this particular earphone, all i'm going to say is: just don't buy this. don't spend your bucks for nothing... the people you see in the forum threads (and review pages), acting like there's no better alternatives and it's price is actually $1 or something. for them, the world of budget earphones is collapsed and only piston 2's are left.
actually, if you buy that piston they talk about, you'll be left with a small acoustic (soundstage, soundfield, positioning, separations) which means unrealistic sound reproduction and overall below average sound quality. even if you manage to live with this kind of bass and treble performance, you're inclined to feel something missing between the bass and treble, the most important part, mids are suffocated.
this earphone is actually nothing new, pretty much identical to brainwavz m4 (except some frequency balance differences) sounds like cheap earphones from big companies (like sennheiser cx or creative ep series) same compact design, same unrealistic acoustic reproduction, same below average performance which excels in nothing.
bought from penonaudio.
if you think piston 2 is just good because of it's price tag, please take a look at this list first. these are some prices i've seen lately, some of them are discount prices. if they're not on a discount right now, i say wait for a discount or spend a little more instead buying something a lot worse:
brainwavz beta was $6-8 on mp4nation (with triple package) also $9 on amazon
koss plug was $7 in turkey, was $10 on amazon and was $12-15 on koss.com
moxpad x3 was $11-14 on aliexpress
audio-technica cks77 (brainwavz beta) was $12-15-16 on aliexpress
moxpad x6 was $14-16 on aliexpress
koss ruk30 was $16-23 on amazon (was $14 in turkey)