The sleeve attaches tightly to the sides of the Wii Remote, only adding a few millimeters around the waist. More thickness at the bottom -- perhaps for pounding in that annoying straighten-the-papers WarioWare game -- adds about another centimeter of girth.
But the bulb-shaped top is significantly bigger than the naked Wiimote. Its spongy feel should absorb a lot of energy; I could imagine unintentionally hitting a table or younger sibling without causing injury. I was concerned that the bigger shape would ruin horizontal, NES-style games, but I ended up liking it a little more than the plain Wiimote. My left hand has always felt cramped next to the D-pad, and the Jacket gives it more to hold.
The Jacket also includes a port cover for use without the Nunchuk. I was mildly annoyed by moving the flap to plug in attachments, but gamers could cut that part off of their own Jackets. (See the gallery for a closer view.)
We've shrugged at Nintendo's 18-million dollar move seemingly to preempt American lawsuits. But even minimalist-preferring adult gamers may like the cover's extra size.