We do. The original Slow ‘N Sear or Slow ‘N Sear Plus works great in the 26″ kettle (Click here for a thorough review from the Weber Kettle Club). However, if you are consistently cooking large amounts of food, or doing a lot of low ‘n slow you may find the increased charcoal capacity will help you achieve longer unattended low ‘n slow cooks.  Similarly, the larger charcoal basket will provide a greater searing area compared to a Slow ‘N Sear in a 26″ kettle without sacrificing any indirect cooking space.