I also used reddit for my side projects with mixed results. My saleable project didn't do well but my OSS project did. My OSS project got 27 stars within 3 or 4 days (which is 3 times the amount of stars I had on my most popular repo).
Another downside is you can't hit your audience more than once without being targeted a spammer, so I like to think of it as a free 'usertesting.com' outlet.