Ganmertell has posted a fairly negative hand-on style review of the ezShot gun attachment for Wii produced by ezGear. From the article:
"I don't recommend the ezShot but, then again, I'm not certain if I would recommend any style of gun frame. They simply put buttons in inconvenient places, making it more difficult than it's worth."
According to the article, the $24.99 ezShot also requires batteries.