How about battery life--the 640 lasts all day and comes with a AAA battery operated portable charger, also it has a mini usb adaptor so that it can be charged off of the 6700's charger--on the down side it has an annoying tendency to slip out of its charger without warning and thereby fail to charge. Although I like my 640, I'm ready to replace it with something smaller and without a geek light.

"instead it has a round pod that goes in your ear."

Can you describe this pod--is it like an earbud? Does it work? I don't like the 640's "rubber gummy-bear inserts."

Oh, no offense intended by the way but we get a lot of newbies who don't know the customs and rules of posting and it seems to me to be more polite to come right out and say what the custom is rather than to flame some poor guy or gal the day after they join the forum--since you had such a new registration date I thought you fit into that category--on the other hand some people are hardened veterans of other forums (I was) or lurk for months and months before posting (I did) so you never know--nevertheless my first thread got closed (and rightfully so). If you stick with this forum you will see just how many newbies post new threads on old topics instead of searching for the existing threads on point--I try to be nice about it and help the person onto the right track--others will just flame right off the bat. So long ramble, the point is don't take offense at my officiousness, I'm one of the nice ones.