I was recently reading another thread regarding the Console Emulator, which highlighted that it is most effective when applied to a lot of tracks, having a cumulative effect over a whole mix. So, to me it seems to make most sense to use it last in chain on every channel (post effects)
I've watched the Craig Anderton tutorial about it's use, and have read other threads saying use it last in the chain, but I've never really experimented using it first in the chain, since it seems the favoured practice is to use it last in chain.
Too bad you can't "Quick Group" all the console emulators and move them to first in chain, to see if there is a noticeable difference.
It takes quite a while to move a large number of tracks console emulators to first in chain position (pre effects), and when I've tried it I don't hear a noticeable difference, but my use of the CE effect is usually very subtle, only a slight colouration of the mix.
When I crank the settings, I don't like it at all, undesirable distortion.
My start up template has CE last in the chain, so I've just kept it that way mostly.