I'm not Bruce, but I LOVE my BBQ Baffle. I am really the only BBQ eater in the house (wife isn't a big meat eater) and our son is only 3 (workin' on him), so I can't justifiy a dedicated WSM.
So, I bought the Baffle last year for the kettle (old Gold kettle). It works really well! I've done several racks of ribs and some butts. Not done a brisket yet. Got myself a Performer late last year, so I'm looking forward to trying out the Baffle on the new grill when the weather warms up. It's been barely above zero all day here by Chicago. BRRR!
It is quite easy to maintain 250F all day long with it, usually it requires the bottom vents be almost closed.
Only issue is that you have to feed the fire every hour or so. You can't (at least I haven't tried) to load it up Minion style and get a longer slow cook out of it without loading.
I don't run a water pan over the fire, but you can.
Chris