100% agreement about the ZW vs MTH Z4000. About all that goes wrong with a ZW is the rollers wear and have to be replaced. A good friend in the Chicago area, years ago, was Ken Koehler, he did ebay under the name "ifixzws". He has passed now, but was the best in his time. Not only did he repair most of my ZW's and Z transformers, but also increased the voltage output on one ZW to 25v, for running Hudsons. Thanks Ken, we miss you.