When writing the summary of this particular lens we can easily say that we get what we paid for. After spending less than 300 USD we can get a lens with a good resolution at the whole focal length range, with well controlled chromatic aberration and optical stabilization – maybe not being 4EV, but...
light weight and compact size, good picture resolution in the middle as well as at the corner of the frame, not very problematic chromatic aberration, good performance against bright light, well controlled coma, reasonable autofocus performance, image stabilization, reasonable price
slight focal plane tilt which results in small, however measurable, differences in chromatic aberration and resolution levels between the two sides of the frame, noticeable astigmatism, relatively large vignetting for all focal lengths, too much plastic in its body