I have tried both the original EPS-3 and the EPS-3S and the latter, the Signature is significantly better. One thing I did come across on both is that they both tend to have "one-note" bass. Some people have called this a "wooly" or "bloated" bass.I would like to thank Audiogon member Bwhite for pointing this out and making a recommendation in his virtual system of using another good power cord to help out the Elrods in this respect. I recently bought a Vh Audio Hot Box with the upgraded nickel-plated outlets and auric capacitors. After extensive break-in, I plugged my Elrod EPS-3S into it and "Voila!" The "one-note" bass disappeared and the bass actually grew deeper with better articulation and individualization.This "one-note" bass,IMHO, was the only flaw of the Elrod, and now with a little help from the Hot Box,is truly a reference power cord.