Hi, greetings from Canada! I am using Railpower-1370 powerpacks (they have MRC’s name on the box) for my HO layout. They may be available in NZ. With 4 installed, and with 1-2 more to come, they are working well for me thus far. I think they are rated at 18Watts (VA to the purists), and have an AC output. I use the AC to feed my home-brew CD unit that fires my Peco motors (also Rix, and Atlas motors & relays). My only troubles were when new: the screws on the AC terminal board are so long and slightly flattened that they can contact the heat-sink inside the unit, and if left unattended will blow it. The fix is simple. Since these units as purchased didn’t have a warranty in Canada, I Dremel-ed a slot in the end of a regular screwdriver to remove the case screws, then removed the terminal block and ground off the excess length of the offending screws. The flattened ends prevented me from just backing the screws out to do the job. I suppose you could grind them off in-situ, but the idea of filings flying around a circuit board gives me the willies!
Real estate constraints at the control panel is leading me to consider building “The Throttle” mentioned in a post during the last month. That will give me walkaround capability and clear the table. It looks like a good circuit.
Even if used without a walkaround, I have no problem in recommending the 1370’s.
Have fun, George