We purchased the BlueAnt Supertooth as a gift for my father in law. He is not very tech savvy so we wanted to get him something easy to use due to the new California laws requiring hands free driving. He had an older model razor phone which had some difficulty syncing with the blueant. Calls were intermittently dropped when trying to use the speakerphone with the older razor. When we tried to sync it with my husband's newer blackberry, the problems were resolved and the speakerphone worked great. Sound quality is exceptional and you hardly hear any background noise. The Blueant also requires no real installation so you don't have to mess with any of your stereo components. My father in law ended up upgrading his phone to a newer Nokia and has had no problems with it syncing with the Blueant. I would've given the product 5 stars but downgraded it to 4 just because of the initial syncing issues. Just make sure that your phone is compatible with the Blueant and it will save you some time.