It was actually Technics’ cheapest direct drive turntable from the late-1970’s, so the current price should reflect that it was a lower level model. You can get a good idea by comparing its 6.1kg weight with the 12.5kg weight of the SL-1200MkII of the relative qualities of the two. Although it’s only half the weight, it’s somewhat better than that in performance, but you get what you pay for, and it cost around half the price when new, so don’t expect it to be in the same performance league.
From some turntable reviews by the same independent lab that I've catalogued, it came equal 47th best of 66 turntables tested using the same method for wow and flutter, equal 49th best of 81 turntables for unweighted rumble (very quiet – the SL-1200MkII only beat it by 2dB, and it was significantly quieter than most turntables of a similar price
*), and was equal 43rd heaviest of 62.
So it wasn’t near the top in any category, but wasn’t embarrassed, and like many Technics models, was actually a leader for performance at its price point. You’d do far worse than to have chosen that as your first turntable when it was new.
* I suspect the former owner is confusing acoustic feedback, which he was probably experiencing, with rumble (mechanical noise picked up by the cartridge), unless he had a poor example which was faulty, as both the specifications (-70dB), and independent testing, showed it was rather quiet.