[rblatt]

I have a 640, 645,and Motorola 850 and this is my experience:

1. 640: great volume to hear, but the microphone is so sensitive alot of people have said it is extremely difficult to understand me unless I am in a fairly quiet area.
2. 645: great volume to hear, noise cancelling is ONLY on the earpiece and NOT on the microphone. Actually a little harder to hear in normal environments due to noise cut-out
3. 850: great microphone, but not easy to hear

I am hoping that at some point someone will come out with a good microphone similar to the 850 with earpiece quality of the 640. Until then, you may end up with $300 of bluetooth headsets sitting on your desk and use a good wired headset as I am now doing. I need the ability to have my clients clearly understand what I am saying and not get frustrated due to background noise or other issues as noted above

I hope this helps.

[DallasFlier]

Originally Posted by rblatt

2. 645: great volume to hear, noise cancelling is ONLY on the earpiece and NOT on the microphone.

I'm sorry, but that's just flat wrong. In fact, the truth is exactly the opposite - the DSP noise cancelling ONLY involves the microphone and the sound that is transmitted to the other party from you, and isn't used on the incoming sound to the earpiece at all.

Originally Posted by Plantronics, from the 645 datasheet on the Plantronics website:

Digital signal processing reduces background noise so your voice is transmitted clearly to your caller, even in noisy environments.

Works very well for me.

[hf1khal]

used the h700 on 3 8700c's and on an 8700g nd it worked the same on all 3 changed the h700 and stayed the same. The h700 seems to need to be in line of site or it starts to break up a bit. I also used sevral others and the one I found that works best with the 8700 is the D640. Will also be getting the D645

[AlbertoM]

The 645 is the DSP version of the 640 and it lasts a couple hours less. They are both outstanding pieces. Some people like the charging options, I did not like having to take the options with me. It is workable, however.

I like the JX10, I had no problem with the hook, as I take it off and use it in my ear without the hook. Works well, with good volume and battery life, good noise control.

Basically, and I realize that some people will disagree with me, I haven't found a BT earpiece that works really well with the 8700C, and to me the 8700C does not seem to have a top notch BT radio, and in the three I had it seems to disconnect (and reconnect) often. One of the reasons I now have the 8700 as data only in my briefcase and I use a V3i as primary phone. The BT never disconnects. YMMV.

[lgreenberg]

Don't let the results of an online forum poll influence which headset you end up buying.

Go out and buy the one you think you'll like best. Try it out. If you don't like it return it and purchase the other one. Try that one out. If you don't like it move on to something else.

[utilso245]

The Plantronics 640 Discovery is the best BT headset around, bar none. I've never had an issue with it in answering a call or providing superior sound quality. It's an awesome little gem of technology.