I'm making a dry run with the Slow n Sear today, getting a feel for it before I put any meat on it. I started it 7 - 1/2 hours ago, and here's my observations so far.
Initially it started to run a little hot, and I had to have the vents almost completely closed to maintain 260 - 270. After about an hour and a half, it settled in at 265 and didn't budge for 2 - 1/2 hours or so. After 5 hours or so, I had to open the vents just a bit to maintain 265, as it was drifting below 250.
At this point there is still plenty of charcoal in the bin, and still some water in the reservoir.
I'm guessing that it will run a little cooler with some meat in it. I can still fiddle with the vents a bit to lower the temperature to 230 - 250.
Overall, I'm pretty impressed with it, as it at least meets the manufacturer's claims. As I already have a Weber kettle, the Slow n Sear for $100 is a fraction of buying a smoker. Next step is to smoke some ribs!
For those interested, here's a link to the manufacturer's website: