I previously had a pair of Motorola DJ-style bt headphones. They looked good, but the bass was crap.
As these were so cheap, I grabbed them, thinking an in-ear style would amp the bass. Well, it does... but the connectivity to my phone is terrible. If I have the phone on my hip, the signal cuts out more than it is connected. It's simply not useable.
Pairing to my macbook pro (as I type this with headphones on and the mbp in front of me) with itunes playing it's similarly more not playing than playing.
A real shame - maybe I just got a defective pair, maybe the reason they can be sold so cheap is that they didn't pass internal QA. Either way, my $23 purchase was a bust.