Personally, I haven't any preference for this or the two-touch type of zoom, having used both types a lot. I will say that this lens was very solid, and the control had just enough drag to prevent slipping the focal length when pointing up or down, yet it operated very smoothly. I found the 5.6 aperture to be difficult, definitely prefering 4.5 or faster for ease of focusing. The relatively limited range of 100mm to 200mm actually covers some good focal lengths. The lens length grows as you zoom from 100 to 200mm.
Contrast is average or a bit better.
Color saturation is a bit below average, something I noticed on other lenses that are SC vs SSC coated. Not a great lens, but decent performance for such an old design, and some useful focal lengths for a truly low cost. Nor did I take any shots with it. Seems the reach when pushing the zoom ring all the way out was way too far for my liking. The lens felt rather unbalanced and it was awkward to my hands and arms.