Got this recently and i use it all the time when im out on the bicycle or using public transport and i find it to be brilliant.
the reason i paid £15 more then a cheapo bluetooth headset is because this uses propper headphones so good if wearing a helmet, and it allows you to listen to your music.
I think its brilliant when im using this for tomtom and music at the same time!!!
if you want to know how it is on the bike im sure RedZ will be here to give you that info
Also these retail at £35 and i got it from Orange for just £22.50 posted