I have one, it works as advertised and is a nice simple piece of kit. As with all pinholes, it's not the sharpest, but I have taken video with it using my EP1 ...
I love mine. Then again I love pinhole photography and all lomography type work (my latest obsession is an SX70). You can certainly have a lot of fun with the Pinwide. Also, don't really go by the samples on the review you linked, they're terrible.
For the price they're asking, it's def worth it. You can have a bit of fun, take some interesting, artsy, or "vintage" photos, and still have enough money in your pocket to take your best gal out for a seafood dinner!