A friend of mine has a Clawhammer system that I’ve used a few times. His is a modular setup and honestly, the Vevor is more simple to use. When I first got the system, I ran a batch of just water with the intention of checking and calibrating the controller. It’s very easy to use with only a quick look at the instruction book and all the temps were dead on out of the box. The Clawhammer controller needed several hours of testing and calibrating. The one big advantage the Clawhammer has is a full mesh grain basket. The Vevor has a steel basket with a perforated bottom, which makes getting your efficiency a little more work.