I tried the Total Contact enhancer and I really like it, so much so I can’t go back and not have it applied to my cables and connectors. It’s probably my favorite add on I’ve done to my system except for maybe the High Fidelity mc-0.5’s but even then when the TC is applied to them they work hand in hand.
But it doesn’t work for everyone. A buddy of mine who I share a lot of similar likes and tastes when it comes to tweaks and certain products does not like what it does for his system. The only negative I’ve had with it is when I applied it to the SR Blue fuse on my Lampi Atlantic dac. Made everything sound thin and bright. After two days of it not changing much I went and wiped it off the fuse and everything warmed back up.