I'd go with the visor unit, hands down. I've got a Motorola one that's getting old now, but when it goes belly up I'm getting another one. Two reasons: number one, when I have an earpiece in for a while, it starts to get uncomfortable. On a long trip it can be downright painful. Perhaps I have weird ears, but my dad got a Bluetooth earpiece for Christmas and had the same complaint. The visor mounted ones don't shift around in your ears, they don't get earwax built up on them, and they're always in the same place when a call comes in--namely, the visor as opposed to in the ashtray, in the center console, on the passenger floorboard, your nightstand, you get the idea. Second point: Bluetooth should be left in the car. I know I may take some heat for this, but in this man's humble opinion, you look like a crazy person walking around talking to yourself in a semi-raised voice if people can't see your Bluetooth. If they can see your earpiece, you look like a self-important D-bag. "Cougar, baby, I'm a real busy important person. Everything I do has got to be efffffffficient, ya know what I mean, babe? See, I've got to be able to take a call at any moment, but I can't just drop what I'm doing here in the mall! No, no, no, my shopping is important, my telephone business is important, and yeah, I got my share of greenbacks. Made some smart investments in the day trading game, now I drive a Bentley and I've got blue flashing LEDs in my ears." (Basically what I'm trying to say is that whenever I see someone with a Bluetooth crammed into their ear walking around town, I automatically assume they have the personality of that standard-issue 80's investment banker in movies, the one who refers to everyone as "babe", cheats on his fiance constantly, and ends up getting his nose broken in the final fifteen minutes of the film.)