You know what caused the ES bulb to come down here?
Down-lights, purely and simply, at least in a domestic installation over here.
I hate the things, they weld the threads after a bit of use and are bloody hard to get out again when you need to replace the lamp.
Yes, I realise there is stuff you can put on the threads, but why should you have to?
The BC idea is a lot better and you don't have problems with idiots wiring the things backwards, either.