I have both. I like them both but they are different. In my system the EE just made the sound sweeter and easier to listen to. I use the ER with fiber and an external clock and it strips away layers of noise, adds blackness. The ER with clock has a much more profound improvement, however if I take out the EE there is enough of a drop off I put it back.
The EE is on an Uptone JS-2 LPS, the ER is on an Uptone LPS1.2 powered by the JS-2. Removing all the SMPS's in my system, even the meanwell I had on the LPS 1.2 dropped the noise noticably.