I have both a 203 and a 303 still running.
The 203, I picked up a couple used and put them together. It runs just fine and is near silent.
The 303, I have been running that since new, back in the mid '80s I think, it still runs OK, but even with a new impeller, it is still somewhat noisy.
Everyone always complains about them being hard to prime (they are
) and that they are prone to leaks (I never had a problem with leaks). Its old technology, it works, but not as user friendly as the stuff on the market now.
Burt