The neckband design is OK, but I prefer a pair of earphones where the cabling runs over th ears to the back of the neck.
I've been using the SoundMAGIC E30 for some time in the gym and running in the park. Sound quality is way better than the CX680, there is no plastic neckband to get in the way and they cost less. Check out reviews online.
Yep, I agree... the SoundMAGIC's are perfect for running or gym work. I just slammed my PL30's in the car door, so have upgraded to the new E30. The slightly smaller earpiece and softer edges makes it a little more comfortable. Sound is also improved over the PL30. A very nice product.
It took me a while to get the hang of the over ear cabling, until I figured out you have to slide the sleeve on the cable up to the back of the neck to keep it all tight. Genius!
In the end I chose the SoundMAGIC E30, because I wanted an earphone that isolates from external noise and I like to route the cabling out of the way. I run in Richmond Park (when I can) and on the treadmill in the gym, so there is no danger from traffic.
I've previously tried the Sennheiser PMX80, but found the sound quality a bit rubbish.