Got the XF200's a few drops ago. Dissapointed. I've used them twice and they make a crazy loud cracking sound if isn't plugged into my iPhone jack at the right angle.
The inline mic/control is dodgy, it turns itself up or down randomly which is painful.
For me, they hurt after an hour or so use, which is annoying due to them being so hard to get a decent seal, I find my ears hurt from pulling them after fiddling for 5 minutes to get them in.
They've got okay sound and are pretty heavy on bass.
Overall save your $20 and get a decent trussed pair of IEMs