If you are running through Legacy and/or DCS, then the features on the ZW-L are more icing than actual cake and aren't going to add any real benefit. If running conventional I can see a benefit of the ZW-L although I still think it's way overpriced for an adjustable voltage power supply. It is pretty to look at, but for me even the ZW stays hidden as I keep my control equipment out of the way to allow room for other things.
There's a lot of ways to slice an apple in this hobby so as long as your equipment is protected and does what you want, there is no need to "upgrade" if it's serving you well.
I asked many years back in the DCS forums this same type question and the best feedback I received were the two following:
1. What is it the ZW is not doing for me now that another transformer would do?
2. Protect yourself with fast blow fuses or fast trip inline breakers.
Honestly, if running DCS or Legacy and looking at new power supplies, I would take Gunrunner John's advice and go with the PH180 from Lionel. Fast trip breakers built in and plenty of power @ 180 watts. Plus GRJ knows a thing or three about electronics.
