Fantastic: definitely comfortable, clear quality sound with just enough bass. This is the first of many bluetooth headsets I've owned where it pairs instantly with your phone when turned on (made even easier with the physical power switch). The function I really like that I didn't realise was included in the automated announcements, e.g. amount of battery power left when turned on, announcement of a new incoming SMS (which can be read out and replied to a single button push). I just wish these can in colours other than black or siliver.