^^^
Both the Total Contact and the Omega E Mats are incredible upgrades by themselves. Together, they do magic. Will they have that effect in all systems? To be fair, the jury is still out on that issue. So far though, the vast majority are coming back with reports like hifiman5 made above. And, that’s just from installing one Omega E Mat in his circuit breaker box.
If you are considering buying Omega E Mats, be aware that initially they may degrade the sound somewhat. I had that experience with the one I recently put under the power conditioner. There was less presence, less like live music. The next morning it hit the WOW factor. So, I guess what I’m saying is to have patience with the Mats ... and the TC too for that matter. As some have stated, in some systems, the Omega E Mats take up to three weeks to sound their best. They just seem to keep improving. Install them ... and then just leave them alone.
Frank