After having a Jawbone I (see previous review) and been very happy with it, i decided to push the boat out and buy the Jawbone II. I paid well over £100 but they seem to be available a lot cheaper now.
There are a few main differences with the Jawbone II the main one been the size! the earpiece is a lot thinner compared to the original version, and is significantly lighter. The battery seems to only last half as long, but does not take long to charge, and came with a USB charge included giving more charging options.
The now named Noise Assassin feature is there again, and is as good as it was on the first version (see the hoover test in my other review).
My favourite thing with this model is that the earhoops seem a bit more solid. however now that the device is so light i have removed the loop completely, and can ose it without. This is much better than before. Unfortunately this means it is much easier to lose as i have spent more time searching for this that i havea for tv remote controls!
The one thingi do NOT like about the Jawbone II is the buttons. They have been hidden behind the case so you have to press the right area to work them. This means that putting in the earpiece often results in pressing the button, which can mean ending a call as you answer it. You need to get the hang of it and then it is bearable, but was very frustration to start with. Also when turning it on and off it is hard to see the light as you cover it up as you press it.
I do still feel that the jawbone II is better than the original, but i think there is still room for improvement. Both are excellent headsets, and either is a good buy.