The Wiimote Jacket is unspeakably hideous

[Grey Acumen]

I ordered them just cause they're free, so I figured what the heck, might as well.

My verdict is actually that it's not good.
I can only speak for myself, but I found that the width makes it more difficult to grip the Wiimote firmly. The rubber grip doesn't really change anything at all if your hand sweats a little. Without the grip, I can get my hand around the wiimote completely and I've never had an issue of losing my grip on it.

on the plus sides, it does help prevent that black gunk from building up on the seams of the Wiimote, which ids the primary reason I've left them on.