Thanks guys! I'm pretty happy with it. Cooks so much better than the Kenmore I had before. And the Charbroil before that.
I'm keeping an eye out for the tray out of a newer model E310 for cheap. They're about half the price and have the ceramic coating. I'll just throw in a wider piece of metal on to the rails if I find one to make it fit since they're slightly smaller than the older ones.
Of note, I didn't have any heat retention problems the other night underneath. Maybe it was my imagination the first time.
I use my kettle mostly for smoking pork and chicken nice and simple low and slow with apple wood. I use the charcoal snake method with B&B charcoal. It has surprisingly stable temperature when you get the vents set right!