I like the pens well enough. The bottle is nice, but it take a bit of time to match the shades and blotting on scrap. Wetting the emulsion helps a lot during application. Small pricks onto the surface, don't drag the tip.
Other alternatives to minimize the dust that causes these white spots is to be really clean with your negatives, photoflo and dust free area when drying, cleaning your condensers(if you have them), cleaning your filters (if not built in), be careful when handling film and inspect negative carriers (if glass). Edwal film cleaner is good, and nose oil for scratches. They also make a no scratch, but I havent used it as I was concerned about putting anything onto the negative that I couldn't get off.