Some people when they upgrade ZW's and the like put in a modern fast blow breaker to replace the old clunky one. It is relatively easy to add a fast blow breaker to the transformer and also potentially put tvs's across the power to handle surges. To be honest, lot of this comes down to personal finances, it is all great to talk about being modern, getting the latest transformer, but they aren't cheap. While a ZW-L has some neat features (it has built in powermasters on all 4 outputs), it is like 750 bucks, you can do the same thing with an old ZW-L you have for a couple of hundred bucks between the legacy powermasters and the fast blow circuit breaker.