The Troy-Bilt Horse walking rototiller is a machine to swear by. I’ve had mine for four years and it’s gone through a lot. I bought a mid-1990s model, used, in mint condition. For a couple of seasons, it was the main tiller on two acres of market garden. I’d sometimes run it non-stop for an hour or more at a time, and for the better part of a day. No problems to date.