jja, the build quality of the lens is good. I like that it has a little focusing lever like my old 50/2.8 Elmar. Compared to the Elmar, focusing is not quite as smooth, but that's not really a problem for me. The arperture ring turns quite easily, it can happen that you turn it and change aperture by accident.
I was tempted to get the 35/1.7 Ultron. I weighted the pros and cons of it against the Color Skopar:
Ultron:
Faster
(Maybe) slightly better image quality
Color Skopar:
Small and light
cheap
good image quality
closer minimum focus disctance (.7m, Ultron .9m)
So far, I have not regrettet getting this lens. I have not had time to use it extensively, but the results so far are very good.