Just received my XIAOMI Piston headphones and I have to say: AMAZING.
These pick up frequencies that I don't think the Sennheiser PMX 80's can that's for sure. Although I liked the sound initially of the PMX80's, I realised it's because I've gotten used to the headset, when I heard details in the music I hadn't heard before that all my other earbuds I have couldn't, I realised the beauty of these incredible bargain gems. I also noticed that after a couple of plays the bass started to have more depth again.
I think these are a set that will require a bit of breaking in, but even from the get go, I was seriously blown away with the quality of these. I kept saying to myself "What truck did these fall off of? There worth WAY more than $9".
Honestly fellow Head-fiers, these are superb. I would recommend these Xiaomi's over the CoGoo's by far, much more depth and definite frequency range provide a clarity that even the Sennheiser PMX 80's have trouble matching. There right up there with the Superlux HD681's in my view and that's saying something for a pair of ear bud earphones. Give them a whirl, I'm certain you will not be disappointed.
I just can't believe how good these are. HOW????
$9? From where?