I've only ever had one EM...A KingPin which I'm kicking myself about getting rid of.  I'm still aiming to get another EM some day.  I've played a few in my time, but given by the time I was old enough to play (10 or so), most had gone from the sites (well, at least pins were sited back then!)...
If I could find one which I enjoyed the game on, I would definately keep.

Bring on the 5-ball!