first of all – you *do* get tunnel vision with this lens unless you are in the upper zoom range, and the canon manual acknowledges it. the menu setup option is just to optimize the way IS (image stabilization) works with the lens. i own a G9 and i doubt it behaves differently with the G7.
this takes you to a respectable 12x zoom, which is good for doing some nature work. the lens does affect picture quality some, i do notice some loss of resolution and contrast. and keep in mind it is much easier to get blurry pictures at this rate of zoom, IS or not – chances are you’ll need a tripod or a hard surface to take optimal advantage of this and maximize picture quality. also, as you can imagine, it dwarfs the camera, so you will need a camera bag. having it dangling around your neck suspended while connected to Canon’s plasticky adapter does not instill confidence. put it in a bag. 
it just seems a tad overpriced for what it is, and at 25% of the camera value and with the fact it only operates in the upper zoom range i can not give it more than 3 stars.
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