Items I've used:
1)  Jabra 250
2)  Bluespoon AX
3)  Bluespoon 5G

Bluespoon AX vs. 5G
1)  Battery life:  The AX is clearly superior here.  The battery lasts for the day, a recharge once a night will keep you talking all day long.  The 5G requires a battery change around 3pm for me.  It comes with 4 batteries, but it is a real pain to have to carry around easy-to-lose batteries, plus taking the battery out and changing them every day, twice a day.  With the AX, you just plug it into the mini-USB charger and you're done.
2)  Sound quality:  Honestly, no big difference to me.  I know the 5G is supposed to be clearly superior, but it was not $250 more superior.  I honestly could not tell the difference.
3)  Design:  5G clearly the winner here, half the size, makes you look like a secret agent instead of a Borg.  The AX is pretty good too though, especially compared to the Jabra and Motorola units.
4)  Ease of Use:  So I almost lost the battery cover for the 5G twice in a week, plus I almost stepped on it.  That's not easy to use.  Try again Nextlink :)
5)  "WOW" factor - clearly the 5G - if you must have ear-bling, this is it.
6)  Comfort:  Same, they use the same ear plug styles.
7)  LED satisfaction:  With the 5G, the LED is so dim that I can't ever tell if it is on or off, though this does make you look less Borg-like.  The AX is bright and easy to tell.
8)  Controls:  The 2 button control of the 5G is not as easy to use as the 3 button control of the AX.  I'm never sure if I held the button down for 2 seconds, or 5 seconds on the 5G, which controls different functions.

Overall:
Clearly, I love the 5G design and form factor, but I dislike the inconveniences that come along with that.  Even if price were not a concern, I would recommend the AX. 

As a bonus - both of these work really well for SKYPE users as well!  Just get a USB bluetooth adapter for your computer.