Several things for me.
Two iFi Active Power Stations - did a great job at cleaning up power issues and really opened up the sound of my system.
Rolling tubes in my LTA microZOTL pre - took a wonderful preamp to a whole new level. Telefunken ECC801s and CBS/Hytron VT231s.
HumminGuru record cleaner (the latest model) - so easy to use and has me listening to vinyl nonstop. Just love it.
ZenWave DSR 4.2 interconnects - remarkable in so many ways. Imaging, their ability to let my other equipment shine, openness, dynamics. Demoing Dave’s PSR power cable now as well.