Joined: Jan 2009
Posts: 44,115
Likes: 6,327
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
The Planet Bike SuperFlash is very good. It's good enough for most people. It's also better than cheap, crappy tail lights. There are definitely better lights, by all measures, but the SuperFlash is still worth consideration.
The Sette ST-316 may be good enough, too. Other than that model, I would recommend setting a budget of at least $35.