Hot Clay's service and delivery is excellent. The WiziWig Clay Shield is just OK. I think it is designed for, and better suited to, Shimpo or Brent style wheels with removable splash pans, as the shield fits on the outside of them. I have a fixed splash pan, so the shield goes inside the pan and is a bit cumbersome. It stops the trimmings from flying out, but so do homemade solutions. It is not the most ergonomic or flexible item to work with. The product instructions actually suggest that if the parts of it pop apart, use duct tape to stick them together - if I was going to mess about with sticky tape, I'd make something that better suited my wheel and trimming set up!
Overall, it does the job, but if you are using a Giffin Grip on a wheel with a fixed splash pan it might not be the ideal solution.