So I think the temp control was added to smaller size Chilli's starting with the 20x24 I ordered. I really wanted to go M&R but really needed that temp control, which was not available on the 20x24 at the time. Rich saw the post here and made it happen, I guess the option was there on larger models already. The rep that sold us ours says it goes on almost all of the Chili's now.
Off topic a little but ours fires up with a Tacana D program, is that normal?