Since you can only vote once in the poll, I polled the 660 as good. It is the headset I am currently using.

I have setup both logitechs, both hbh and the jabra 250. All the bluetooth seemed to work the same on multiple XV6600.

With the bluetooth being equal the logitechs had the best sound quality both talking and hearing overall. The Mobile Freedom's size is much nicer than the Standard logitech. The mobile freedom is hard to put on but once you figure it out it is quite comfortable.

Jabras sounded the best in noisy enviroments for listening because of the ear gel in the canal, but in any enviroment the noise cancellation just wasn't up to par. In a car with all the windows up, people have a hard time understanding me with the jabra. This is probably the most important place for me to use my headset so that is unacceptable.

The hbh 300 was the most comfortable of the bunch but it was quite large. The 660 is the headset of choice for me because of size, sound quality, and the LCD with caller id.

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AT&T Jailbroken Iphone 3G 2.2