I don't really see why you'd need one with any kamado-style cooker, the vents work fine. Even my Akorn will hold temps like an oven for 10-12 hours with only very minor adjustments. To me, learning your pit and how to control it is part of the art of cooking bbq.
...Half a yard full of crap to cook on like everybody else...
Slow-to-average-speed [COLOR=dimgray]GRAY[/COLOR] Wal-Mart thermometer
Just a hungry hillbilly lookin for a dead critter to cook
Four [URL="http://www.bbq-brethren.com/forum/group.php?groupid=39"]Zeros[/URL] in one [URL="http://www.bbq-brethren.com/forum/forumdisplay.php?f=86"][COLOR=red]throwdown[/COLOR][/URL][COLOR=red],[/COLOR] baby! :bow: