Enlarging lenses seem to be available for very little cost.
What differences can be expected when using enlarger lenses for general or macro photography? When might one prefer to use an enlarging lens over another type of lens or technique? For instance, is there any reason to use an enlarging lens for macro photography instead of, say, using extension tubes with another lens?
I'm interested in optical differences, but discussion of other differences are welcome. Descriptions of experiences using enlarging lenses and reasons for choosing to do so would be appreciated.
I understand that enlarging lenses typically don't come with built-in focusing helicoids. They also seem to have apertures that are F3.5 or slower.