I found a good deal on a Like new MTH Z4000 transformer from 1998. Is there any difference between early models and more recent ones? Looking to upgrade from a MRC pure power and postwar ZW (with a Dallee circuit breaker) since I run a lot of modern TMCC/ Legacy and Proto 2/3 locos.
Truthfully, the MRC Pure Power is a very nice transformer, not sure why you feel the need to replace it. If you're worried about circuit protection, consider adding the PSX-AC to the outputs, that's the best protection going.