The PT510 is big and bulky. It's not the most comfortable headset either. The WindStop feature is complete BS - wind noise makes the other end completely unable to hear you (as with most other BT headsets I've tried). However, the sound quality is excellent, and the volume on the headset can go really loud. To get a sense of how loud it is, I usually can hear the other side fine if I have the volume level set to 3 (out of 7). For people with bad hearing, this headset would be very helpful, I think.