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Title: Plasticky but it works
Review: I use this as a macro lens mount for a macro filter, not for its intended purpose, but some tests I ran showed that it is of pretty decent sharpness at the wide end, trending downward as you go towards 200mm. But then that's what 70-300mm lenses are for. The build quality is very plasticky so try not to sit on it or pick up your camera via the lens. Also, and this is kind of annoying, but there is no full time manual focus; it's either autofocus or manual focus. This limits its effectiveness for those who like to use autofocus to get in the ballpark and then make fine adjustments via the focus ring. VR seems to work okay--not particularly well or badly. Last note: this is not a fast lens so this is really only useful in good light or with a flash; or with a tripod against non-moving objects. If you don't have a tripod then VR sort of helps against non-moving objects, by reducing hand-shake effects, but it won't help if what you're shooting moves at all.
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