I tried it 2X without the water pan. Once with some chucks that came out OK, and once with a couple of butts that produced way too much smoke from the drippings, and I didn't like the taste of the meat at all. Now I use foil lined water pan, with little crumpled foil ball underneath to create an air gap, and that seems to work for me.
2 OTG One red one black
22 1/2" black Bar-B-Kettle with rotisserie ring
Brinkman dual zone charcoal grill
Webber Silver Genises B
3 burner camp stove