BlueAnt Speakerphone opinions

[bergman]

I'm trying to select a new bluetooth hands free speakerphone. I've used the original Blueant Supertooth for years. It has excellent sound quality and noice cancellation, but it doesn't auto-connect when turned on.(User must press a button to connect. This gets old when running errands and in and out of the car a lot).
I'm considering the BlueAnt S1 Visor and the BlueAnt S3. My most important criteria is noise cancellation. I don't want to torture my callers with background noise. So...please post your real world opinions on these devices or any similar that you like.