I work at One Dream here in NYC, and we have a healthy
stock of E0s, E3s, E9s, and C6s, with e-pac amps for all and a few P1200s with cards for the E9s. They're all pretty popular, and really nice sounding speakers.
The E3s are a pretty common
front fill and delay cab on Broadway and Off-Broadway these days. My
current show has a handfull as underbalcs, and my last show used them for frontfills and DS foldback. The Acme guys tend to use them for
front fill quite often, I'm pretty sure they had them on Fiddler, not sure about the other shows they've got out at the moment, but it's a safe bet.
--A