I, too, went to a lot of trouble to make sure I got a bluetooth mouse because I didn't want a dongle.

And after using one for a while, I, like Bruno, have decided that bluetooth sucks for mice. Reasons:

- When saturating the wireless connection with a large file download, the bluetooth mouse performance drops to an awful, choppy mess.

- When first activating the mouse or when first waking up the laptop from sleep or hibernate, it takes far too long for the thing to make a connection.

- Sometimes after waking up, bluetooth doesn't connect at all (this might be the laptop's fault).

The dongle mouse has none of those problems: No dropout during large file downloads, instant-on, and no trouble with connections.