Hello,
First of all, I need both RCA and XLR as I have two setups which I alternate, one with the Jadis monos and either Ref5 or Karan KAL Ref MKII preamps, this setup is fully balanced, and one with the Sati 520b, which only takes RCA.
Both setups use the CD7 as source and therefore the "problem" as this player has a very high gain.
After a couple of days with the Rothwells, I can only speak highly of what they did in my living room. I first ran the RCA's which started a bit flat, lacking extension and dynamics but after what seemed to be a short burn-in period they opened up. The XLR were ready to go from the first minute installed.
In both cases, the effect was positive in many aspects, lower noise floor, darker back ground, wider and deeper sound stage, faster highs and mids, much more controlled bass (and with the Euforidtes you must control the bass...), etc while I couldn't detect any negative impact.
I'm not an expert but I guess that most up sides here are due to the ability to play at higher volume settings.
Bottom line, from my point of view, after a two day trial, highly recommended.
Best.