What has been your most satisfying component?


I don't think I have seen this question asked so here it goes. Many of us tend to buy and sell looking for the ideal, the holy grail, what works best in the current system, or whatever.
What component (or components)have stood the test of time in your system? I've been through quite a few but some have stayed despite having bought their replacements and subsequently selling them. I'll share once we get a few posts to get things going.
nutella
I bought a demo McCormack DNA225 and had Steve McCormack do his Platinum and ARC2 upgrades/mods (whatever you want to call it). The amp has exceptional sonics and has been very dependable (knock on wood!).
Sometimes think about a tube amp but would keep the DNA225 even if I got one.
Plus, Smc Audio was a pleasure to deal with.
Amendment to 10-28-08
Joule Electra VZN-160's are by far the most satisfying!!!
My Mcintosh C-22 when paired with one of my Mcintosh SS amps is awesome. C-22 cost alot but well worth the money spent.
My room treatment acoustic devices, for sure, followed by
my Magnepans 20.1 replaced with Analysis Audio Amphitryon and 1993 built Nakamichi MB1000 Music Bank CD transport.