Hey Tony, I have a Performer (one touch) and a Bubba Keg Convection Grill (predecessor to the Big Steel Keg). The one touch is pretty easy to control temp, and the Bubba Keg grill is pretty easy as well. There are a few tips, if you get too hot, it will be a challenge to bring the temp back down. This is more of a problem on the Bubba Keg grill since it is so insulated. But once you learn how to control the temp control through practice, it is easy to predict how the cooker will behave.
My opinion, I think everyone needs a kettle. They are cheap if you get the one touch silver, and they are just awesome cookers. Good luck with your decision.