Got mine a bit ago, maybe a couple of weeks now. They do a good job of protecting the Wiimote/things it bashes into, but im not sure i like it. It makes the wiimotes heavier, and takes away its minimalistic sexiness.
Granted they probably will be a essential safety net for when having others play. But I don't think I'll be using them much, but I've always been careful when I played.
On a side note, a week after I got the 2 I ordered, I got another 2 through! I think the first time I submitted, the site told us there was an error and so i tried it the next day and it went through that time. So I kind of have 4 jackets and 2 wiimotes now
Dan