Most satisfying system change in 2017?

For me "roon"
It's Sooloos Meridian without the price tag, but better--the generation for high end

Here is a review.
https://www.google.com/amp/s/www.techhive.com/article/2923915/home-audio/roon-is-must-have-software-...

Built speakers, TMW config.  Crossovers are modified from Icon Parsecs. Drivers from Seas, ScanSpeak and Audax.  Stunned at the results.  IMHO they compete with factory towers @$10k. 
(Unavoidable pride/bias I suppose, but verrry gratifying project). 
Timbre and detail..can’t get any work done cause I can’t walk away. 

Iwal22, can relate.  How did you solve potential cabinet issues?  Biggest challenge in my experience.  Pictures online somewhere?

Change from 20 yr Spectral owner to Pass Lab.

Added a Tru-lift tonearm lifter to TT. Makes playing vinyl almost as easy as CD. No adverse effect on SQ. 

Added a Schiit Audio Freya Tube Preamp and a Primaluna Prologue 5 Tube Amp.I use the all tube ckt for music and have even left it in the mix on some Movies after I had played some Dvd or Bluray concerts.Pretty sweet but,for Metal I go back to the SS Ckt.