A lot of the really helpful advice in this thread, and in a few
older ones, led me to purchase the
Sola MCR. I got a nice deal on a NOS model from an official distributor who is phasing out their Sola gear. The MSRP is pretty pricey, though nowhere near Shunyata prices!
This thing is heavy! Some users have reported using 120lb+ cvts, and this 70lb anchor was troublesome enough to move around. I got rid of the budget Monster cable strip I was previously using and plugged my GES and gamma2 directly into the cvt.
I wasn't really expecting much difference in the SQ. I mostly bought the cvt as insurance for the BHSE I have on order, as I would probably have a heart attack if a surge damaged it.
I tried a listening session immediately after turning on all my equipment and was disappointed. Everything sounded considerably more thin and insubstantial than I had remembered. I wasn't too surprised though, as the GES does not sound very good until it's been on for at least an hour.
After an hour passed, I tried another critical listening session. The difference was subtle but unmistakable. The 'fuzziness' I had attributed to tubes and a sub-optimal amp for the O2s was mostly gone. The biggest difference is that everything just sounds cleaner now. The bass is a little tighter, the trebles are more crisp and defined, and the O2s have a little bit more of that electrostat sound, where the music just seems to materialize out of thin air. The effects weren't as dramatic as some audiophiles have written, but they were appreciable. I also now have the peace of mind that my gear is protected from everything short of a direct lightning strike or super soaker.
In conclusion, for a low or mid-fi user, the SQ did not increase enough to justify the price. For someone who skis the slopes of summit-fi, I'd say it was worth it. More importantly, however, is that this should do a better job protecting gear than much more expensive audiophile power conditioning gear. Cvts can regularly be found in hospital, lab, and manufacturing surplus sales. If you don't care for aesthetics, you can get a unit which needs to be wired, and save another 70-80%.
There's a downside to the cvt: it gives off an audible hum, somewhere between a desk fan between medium and high speed. With loud music it's not noticeable, but at healthy listening levels, it's a little annoying. I'm going to try moving it 20-30 feet away and use extension cables to connect the cvt directly to the amp and DAC to minimize the hum.