I just used them in my 18.5 WSM this past weekend. They are great for low and slow.
- 8:30 am: Started at with full load of JD Briquettes and minion middle using a coffee can and started with Kingsford Professional (they get hot quick like always).
- 9 am: Put on (2) small pork butts for 7 hours. Temps locked in at 225 - 250 and only needed one small vent adjustment in that 7 hours. Just fantastic. Nice clean smoke.
- 4pm: pull pork
- 5 pm: Put on chicken legs for dinner. And that ran at +/- 225 for 1.5 hours (1 vent adjustment), before I tried to raise temps to 300 deg (dry, foiled water pan). I had trouble getting temps up at the end of my chicken cook which isn't unusual for my WSM and my typical B&B orange bag. I had to vent the side door a bit (via turning door upside down) to get 300 and above.
- 8 pm. Pulled chicken, closed the side door, but was running all vents wide open.
- 10 pm: Thermometer was still over 275 and there was maybe another hour or so.
Conclusions: 14 hours of low and slow without reloading (our temps were in the mid 80's and high humidity). Likely more as I ramped it up to get hotter via venting for 1.5 hours. I was extremely happy with the cook. Less ash than B&B and I think it was a cleaner burn. The new B&B since they got bought out, isn't as good IMO, and I think I will move to JD for my future LAS cooks.