I have no real issues with the product itself, it is well made and does what it says it will do.  And I like cool gadgets.  However, it requires the Kamado to get insanely hot - which we were having a hard time achieving - and it is summer time. LOL   So we went thru a lot of coal. We had always made pizza's just on a stone in the Kamado on the raised grate and it did work well.  I am thinking I may have bought a large "cool accessory" that I am just gonna have to figure out how to store and go back to the old way.  But... time will tell..