This is aside from the current conversation regarding the verticality of the bag in the bath - (though Nathan's comment regarding natural convection was a very nice 'aha!'). Here's one for y'all - especially the bbq purists - and it is blasphemy to the brethren - I've started doing my pork shoulders Sous Vide. Normally, I would trim, tie, and rub the shoulder, wrap it tightly in Saran Wrap and let it sit for a couple days before smoking. Then Smoke for about 5 hours @ between 230 - 280, then finish in a dutch oven, rendering the remaining fat into the BBQ sauce. Recently, I've started to put the rub on the shoulder, then vacuum seal the roast. a day before 'cuing, I put the roasts into a water bath @ 140F for 24 hours. pull the roasts out, let rest for a few, then smoke for 3-4 hours. Finishing again in the dutch oven, just because I like how the smoke gets imparted to the sauce. I started doing this because I could not get my BBQ "done" by the time guests started to arrive. And it works great. I can get a really tender pulled pork thats melt in your mouth good. Not traditional, but I can still get a decent bark on it and a decent smoke ring, and I don't have to watch the fire nearly as much. On the one hand, I feel guilty for cheating, on the other hand - it's just really tasty. My friend from Georgia even gives it his stamp of approval. Nathan - I am really looking forward to seeing your book, and I am finding the cash to order a copy. I am glad its a book and not an epub. Books are a paramount technology. Apologies if my BBQ/Sous Vide method is in any way offensive and/or sloppy cooking. It's just the way I roll...