I have used the 8000 since it was released, about 2 years ago.
I bought it because it is a nice looking mouse that fitted my MacBook Pro
and my hand, and it has a massive amount of buttons, something I still cannot see with even the most recently released bluetooth mice. Left, right, forward, back, scroll wheel, scroll wheel left, scroll wheel right, scroll wheel click, that's a total of 7 buttons + wheel.
I looked like a mistake when I first tried it, because it uses an Microsoft their "First Connect" flavour of BlueTooth and my Mac was not able to pair with it.
Luckily, a lot of other people had the same problem, and the solution turned out to be pretty simple. To add the mouse using the bluetooth control panel, choose "Any Device" instead of "Mouse" and in the next window, choose "Passkey Options…" and "Do not use a passkey with this device".
Then the mouse connects without pairing.
I use USB Overdrive with it since Montalcini released the bluetooth version of his excellent driver software. If you can afford the mouse, you should also spend the extra 20 because it's worth it.
Bluetooth mice in general aren't as responsive as RF or wired mice, but I do not use my MacBook for games, so it's OK.
Another thing I see with MacBook users ( my collegues ) that have bluetooth mice, they all have a love/hate relationship with the little rodent. Bluetooth mice seem to need that extra little bit of attention...
One more thing. This mouse can be used with a rechargeable battery. I used other mice with a built-in battery, and when the adapter dies, you can throw away everything.