I think it's a pretty new mic.
Geoff Woods, on rec.audio.pro, had this to say about it:
"For a good vocal mic that you can use equally in the studio as live, along
with the AKG C535, the new
RODE S1 which I found pretty amazing, especially considering it's price.
I tried the S1 against an SM58,
C900, C5900, D3800M, and it had similar
response to the codenser AKGs, but 'smoother' Also markedly less pronounced
proximity effect, handling noise, and popability that all the other mics.
I would like to run it against a KSM-105 but don't have access."
Would be great to know if it was a handy instrument mic as well...