I had a M42 C/D 2.8/28mm briefly, and it was ok but nothing special. I've also had a Komine-made Soligor C/D 2.5/90mm macro in K-A mount and a M42 C/D 2.8/55mm. The 90mm goes to 1:1 and is the same lens as Vivitar/Elicar/Panagor 90mm macro. The 55mm goes to 1:2 on it's on but usually comes with a "1:1 converter" which is actually just an extension tube with matching looks. I think this 55mm has been also sold under the Sears brand.
Both these macro lenses were very nice but I don't miss them because I now have the the Vivitar 2.8/100mm macro (which I'm not selling
).