I have an MF one of these, which I used for a long time as my "walkaround" lens on Nikon F and F3. It's decently sharp most of the time, and a very convenient length, and the pseudo-macro feature is nice. At the same time, I find it an infuriating lens in other ways. I bought this long long ago along with an 80-200 /f4 AIS lens, of similar vintage. That latter lens is beautifully sharp, constant aperture, and nearly parfocal, and mine has a nice tight zoom ring. The 35-105 is variable aperture, variable focus, and though it's nice to have some kind of macro, it's ergonomically clumsy. Mine also has a loose zoom ring, so to use it for macro on a tripod I had to stick it with electrical tape.
Apparently, in the sample variation lottery, I came out all right. Mine is at least sharp enough for slides, but I confess I have not tried it on digital to see if it holds up.