Thoughs on these Bluetooth headhpones for ipod please

Does anyone have experience with the Bluetake I-Phono BT420 headphones?

http://www.expansys.com/product.asp?code=114076

When i am at the gym, it does annoy me when im all hot when working out, and i have wires in the way, i know this adapter will increase the overall size of the ipod but i think it would be worth it,

Anyone have any expereince with this?

Thanks