I have the Jumbo and have done over a dozen different cooks on the guy. I love it.
Low and slow is no problem on this guy. I strongly suggest shelling out another 18 bucks and getting the hinged grate down at Home Depot. It makes 6 hour cooks much easier.
If you get the hinged grate you can invert the original grate and use it as a second cooking surface. I was able to grill 20 chicken thighs with indirect heat that way.