an article on the 18-55 II lens and the kit lens in my K-x.
This 50-200 zoom is compact, quick, quite and easy to use. It has the function of quick shift (QS, The lens releases the gear with the focus-driving motor in camera body and allows manual adjustment of focusing once the auto-focusing finishes). The lens surface is also marked both zoom and distance scales, but no magnification scale on the barrel.
With a metal mount, this lens was built of three layers of barrels. The front/most internal one does not turn while focusing. If you buy new, it should come with a hood. I would rate its build quality at 9 on a 10-point scale.
I used it to shoot kids and got satisfied images from my K-x.