Had these come in today. Completely forgot I ordered them.
Keep in mind the below comments are smack out of the box. I listened for about 45 mins then compared them on a few songs with the Brainwavz XFit XF-200.
Not only do they look VERY much like the XF-200, they sound quite similar. The removable cable is f'ing glorious as well. Really soft, malleable, and flexible. Nice and thick below the y-split, a bit thin above, just like the XFit. Really shocked to see a cable of this quality on such a cheap earphone.
I had the same fit issues as the XFit, BUT, I tossed on some large Sony Hybrids and boom, problem solved. No idea why I didn't try those tips when I reviewed the XFit, but I'm going to have to amend my review as a result.
Regarding sound, the immediate difference seems to be in bass quantity. The XFit is vented while the W1 Pro isn't. My well-used XFit is notably bassier and has a bit more treble presence. Mids are nearly identical. Overall the W1 Pro seems a little more balanced vs. the more v-shaped XFit. Soundstage feels about the same.
I bought them here for 12.19 CAD. Price hasn't changed it seems: http://www.aliexpress.com/item/QKZ-W1-Earphones-Official-Ear-Headphones-New-Smart-Headset-Phone-Headset-Bass-For-DJ-MP3-With/2049382702.html
I thought I ordered them in blue, but they arrived in black. They still look decent, but the blue and red look pretty sharp. Checked my order and color only says "with microphone" so...not very helpful, haha.
Either way, out of the box these seem to be a pretty awesome little iem for 12 bucks. Feel well built, cable is excellent, and their sound is solid. Looking forward to putting some serious time into them to see how they stack up to the XFit with some more hours.