I have no experience with the TD-158, but I am the original owner of a TD-166MkII, which I bought in 1984 as insurance against turntables becoming extinct (LOL!!!). A quarter-century and one belt-change later, it is going strong. It is pretty quiet, speed is stable, and the original Thorens arm tracks well. The anti-skate is a little tough to get right, and cartridge mounting is made more difficult by the headshell design, which favors appearance over convenience. There is, IIRC, a similar model with an auto-lift at the end of the record. It is otherwise identical to the 166-MkII, AFAIK. These 'tables were West German made and very high quality for the time. The carbon-fiber tone arms, with detatchable wands were well regarded, although many chose to upgrade the arm.
If you buy a used Thorens and intend to use the original arm, make sure you get the setup tools Thorens included with the 'table, and the instruction manual.
If you buy a used Thorens and intend to use the original arm, make sure you get the setup tools Thorens included with the 'table, and the instruction manual.