Take a look at my build thread in my sig line, I did the OME +2 conversion and love it. There are some on here that have done it and can quantifiably point towards the pros/cons, like NWoods notes it doesn't improve articulation. To me performance is a subjective statement, i.e. my performance when the truck was on its bump stops in the Empty Quarter was pretty piss poor, but when the EAS worked it was great. Likewise I do think ride quality may be slightly worse but that is somewhat subjective too-or rather perhaps I'm just conditioned by my D1 (and Tacoma) to the point where a coil sprung LR3 still is quite comfortable for long haul driving comparatively.
I would say it rarely makes sense to do it based off initial cost compared to rebuilding or replacing an air compressor for the 'normal' suspension failure; on the other hand if you hit a point where its compressor + air struts + valve blocks...now all the sudden doing it could make more sense.
I have no regrets about doing it, but it makes sense for my build, my application, and intended purpose. That is not a universal truth.
r-
Ray