Plantronics 640 vs 665 on the 6700?

[boe]

Hello,

I currently have a Plantronics 640 and 655. The 640 works pretty well but I've had it a year and a half and it is having a hard time holding a charge. I have the 655 and it sucks when used with the 6700. I've read other posts pretty much confirming this unit doesn't work well with the 6700 even with the latest AKU 3.5. The 655 sounds fine on my end but when flipping between the two, my clients often say what, you sound like you are talking through a tin can or garbled even if I turn the noise reduction off on the headset. I hear the issues with the 6700 have something to do with the BT stack, not so much the headset.

I can either buy another 640 or consider the 665 - which I have not tried yet. Has anyone tried it yet?

[Trident]

My understanding it the 665 is the same as the 655, but with a car charger included.
I had the same experience when my 640 went through the wash and had to be retired. I got a 655, but it wouldn't hold a charge and stopped connecting after a month.
Plantronics just relplaced it with a new 655- and this one has something called "AudioIQ" (written on the box). I don't know what the difference is, but the sound quality is much better than my original 655. It's still not as good as the 640, but I'd recommend it now and I wouldn't have with the original.

[boe]

Thanks - I have the replacement headset plantronics sent me - but I don't see audio IQ on the box - perhaps that is why mine sounds just as bad as the original 655 I had.