Last September I read in a post where somebody bought some kinda voltage meter and just started measuring everything he could get his hands on. Somewhere along his journey he mentioned his findings from measuring a Furutech outlet. Well, I've been using Furutech outlets for about 14 years now. I've had a few other audio-grade outlets prior to the Furutech's but I liked the Furutechs best.
Anyway, upon reading this guy's findings I did a little homework. In the end I purchased 4 fully-cryo'ed Hubbell outlets from Jena Labs. Installed them and after a few days of burn-in, the upgrade was surprisingly quite large. Not surprisingly. Shockingly. And this is no slight against Furutech as they were better than those I've had before that including Oyaide and a few others. Anyway, I actually expected to hear very little or no improvement but what I got was rather significant. Almost like the system had previously been playing on 105v but now it's exactly 120v.
I'm kinda' closed-mined when it comes to enthusiasts buying measuring tools and their findings. But when I read his findings on the outlet in question, something perked up in me to at least do a little investigation. Well, at least I'm trying to be more open-minded.