Nope, no review. Not sure if I will. They sound good, but that's not why I would buy them. Their draw for me is features and build quality at such a low cost. As an everyday or sports iem they are pretty awesome. Sound quality won't blow you away but it's more than acceptable and if you lose or break them you're not out much.
I think the XFit is the better sounding product (though not by much) and the flexibility of full iOs and Android compatibility is excellent. The price, higher quality cable, and proper memory wire of the W1 is a nice draw in QKZ's favor.