We have used Both the ZW-L and Z4000's at our club layouts. We have had two failures on one channel on two Z4000's. One was sent back to MTH who found nothing wrong. After returning it worked for a sort time then had the same failure . It was bought new in 2002. We had the second Z4000 failure 0n a used one bought on Ebay, no info on age. We have had failure on the older ZW C lionel transformer with two 180W bricks. Lionel could not furnish replacement parts. Buy Z4000's with the thought that when they fail, there will be no parts. We are now using two Z4000's on our large club layout with no problems.
I would consider the Lionel ZW L except for the high cost. Listen to Gununnerjohn.
