What's the best and/or favorite piece of equipment you've owned? And do you still own it?

Yes/no/maybe.

Thanks for the opportunity to revisit memory lane!

NAD 3140, Nakamichi 480, Sony PS-X60 w/Shure V-15 and Celestion Ditton 15XR w/factory upgraded tweeters/networks on Celestion Chrome OEM stands. My High School system circa 1982 when time stood still :-)

Gone but not forgotten.

Still have ARC GS150 amplifier (which I love), McIntosh C22 (recent issue), custom speakers made by Rudy Bozak for my father, and I do not know their age.  

My VTL 450MKII Amps.  They are the best amp's I ever owned.  Before the 450's, I used VTL 300 Deluxe MB's for many years.  Owning the 300's gave me an opportunity to get to know the folks a VTL very well due to repairs and upgrades.  The 450 have been trouble free since I got them 10 years ago.  Since buying the 450's I've talked to VTL twice, a quick question over the phone and at CES.  I purchased both pairs of VTL amps used, I could never afford new ones.  VTL has always treated me as a valued customer. 

My favorite: Thiel CS2.2 amber wood speakers. My first true audiophile purchase in the 90's. I enjoyed listening to them for decades.  Amps, pre-amps, and sources came and went, but the Thiel CS2.2 speakers were a constant. Just traded them in for about $500 less than I paid ~30 years ago. $500 / 30 years < penny per day listening cost.

I upgraded to Thiel CS7.2 speakers, so no regrets.