I didn't have good luck with the moto HS850. At maximum volume, it is not quite loud enough for comfortable listening, and the microphone picked up too much road noise while driving so that the person on the other end of the conversation frequently complained. The plantronics voyager 510 was far superior on both counts, but broke after a couple of months (no warranty if you buy on ebay). I may give plantronics another try since I haven't heard others complain about quality control. Also considering a gennum nxzen as these are reputed to have superior noise cancellation microphones and also have good noise blocking earphones. I found the Jabra to be OK--somewhere between the moto and the plantronics for sound quality for both me and the person on the other end--but lacking enough that I still purchased others in search of a superior solution.