well, i went by future shop today and the price of the mouse was lowered to $35 CDN, so i bought it. So far i really like it. The "all-terrain" thing is actaully really great. The mouse works anywhere, on my knee, on the couch, the pillow... The scroll thing is cool. Its nice to be able to touch the top or bottom of the scroll pad and just continuously scroll. Dragging your finger on it works well too, and all in linux!
my only complaint is that there is no middle click (which is "paste" in many linux window managers). By coincidence, dragging my finger to the left has the same op code as paste! heh, so that worked out well. I can also click both buttons at the same time to emulate middle click.
overall, i really like this mouse. Its small enough to make a good laptop mouse, the solid state scrolling is neat, its wireless, and it works in linux
aside: one oddity of the mouse is that the scrolling makes the same "click" noise as a scroll wheel.. weird.