I get occasional comments on the taillight, mainly from other cyclists. Living in an urban area, drivers don't really like to stop at night, and comments from peds are mainly something like, "Dude looks like five-oh." But once, in the grocery store parking lot, a mom said she wished she could get her kids lights like that.
I get more comments on the headlight than the taillight, in fact, another tonight on the way home from work.
In an interesting twist, a few weeks back I was riding along and encountered another rider ahead with a really bright headlight. As I pulled even preparing to ask about it, what did I see on her bars? Yup. A 200L-AA, just like the pair on my bars.