Don’t know about the 3ex but I’ve had the 1ex for a couple years now. They are really amazing with a good front end. Very revealing. Not show offy but play a well recorded album and they are full range fantastic. Very layered and great tone. I would love to put them against some recent 15-20k speakers at my house and see how they fair. My guess would be very well.
Build quality is off the charts as well! Great buy on the used market if you can find them IMO.