I had a Greenstreet in my LP12. I suspect it would be very difficult to tell it apart from a Keel. However, around that time, after listening to several Klimax Sondeks, I decided to cease spending money on my LP12 so I returned the Greenstreet. I had discovered other good decks which did not suffer from degenerative upgraditis.
If you look at the interstellar leaps in performance available with each official upgrade to the deck which already has an absolute monopoly on rhythm, tunes, and evoking excited responses from a wife in the next door room, by now it must have reached such a stratospheric standard that all other turntable manufacturers are insolvent and queues of many miles wind their way to every Linn dealer in the land.
Whereas my experience is that the audible advances of all the upgrades are marginal, sometimes worthwhile, but seldom justifying the price when Vilchur's original design flaws are still there and exposed by a £680 Technics SL-100C.
We are like the owner of a Ford Capri who has lavished a small fortune on keeping his pride and joy running since the 70s and we are addicted to the drama of urging it on, wheezing and spluttering its plucky way over the next hill as we listen, white-knuckled, to the engine for clues about what to replace next, so that we can keep up with the ugly modern junk which has just quietly flashed past. This is real driving, not that.
It's romantic, but it's mad.