By all accounts, those are awesome grills - take some figuring out how to control the temp, though. You can't adjust the burners, can you?
More about slow cooking...
yeah, it is on or off... you can adjust the air flow to control the temp. great for parties and what not because you dont have to tend the grill... but it is slower than a traditional grill. i prefer my steaks seared in a cast iron skillet, but i use the holland for everything else.