My hesitancy would really only revolve around the notion that their offered rate to you is too good to be true. My guess is that they're discounting their cut to get someone mowing it asap. That company is clearly in their early growth period, so it could be a loss-leader as they try to grab customers and contractors. Their business model is a very expensive thing to scale quickly.
I know lawn & landscape marketing, branding, and web strategy. I'm not anonymous, I just don't self-promote.