Hi Michel,
I was primarily interested in the home automation industry (since I'm writing an academic paper and I wanted to motivate why we chose ISY as the target for our research and not others. there are other motivations, but generally, having some kind of market data is helpful to introduce readers to the area of research).
I do know that the most popular way to control an INSTEON network is with an ISY device and since INSTEON is quite well deployed, you could hypothesize that ISY is well deployed too, but to make that concrete, if I could say something like, to date, X million units of ISY have been shipped, that would be nice.
By developers I meant people who write Android/iPhone/Windows smartphone/desktop apps that communicate with ISY over the SDK.
-Earlence