Viper ztrs are made by the same company that manufactures the MTDpro line of mowers. Lesco is the owner of the manufacturing co.<br>This info is given to me from the local lesco branch manager. As far as quality, I demoed one with a peco collection system , unit cut ok but had some kinda funky vibrations. This mower has not been on the market too long and everytime I'm at lesco there appear to be a bunch stacked up in the back of the warehouse waiting for service. I did not buy one becuase i asked how many they had sold and the manager told me 15 and on the day i was in there were 8 in for service. Some of which did not seem as though were moved since I had been there a week before.