At this time the only smoker I have is the Chargriller w/sfb. I like sitting with a beer and tending the fire. It will go steady for 4 hours with an expanded metal charcoal box if you use lump. So far that is the only mod I've done. When the weather turns a bit warmer, I will start on some others. It is a little leaky at the moment.
Chargriller Pro w/SFB 3 generic digital thermometers