I'm using a literal push mower; it doesn't even have self propel! lol I don't know what your area is like, but I've used self-propelled mowers for up to 30 customers. I don't think I would do that again, but right now the push mower is doing OK for most of my lawns. The biggest reason I haven't bought something bigger is I didn't start until May and I don't have very many customers. I don't know what your area is like but another thing to keep in mind is the lawn size. I only target small lawns because of my mower size. I would say it's pretty good on lots up to 9K SF, maybe even larger, but it will be most efficient on smaller ones, which also means your can price more competitively. You will have a hard time competing on larger lawns because it will take too long.