One of those accessories I didn't really think I needed in my 26.75" kettle. Now its permanently parked there. I have done some low and slow, high heat indirect, searing, etc.
I'll still prefer to use my WSMs for smoking, but I did a recent smoke with the SNSXL and it did just fine.
The value of the 2 zone for me is if I need to use my 26" like an oven (on these hot summer days) to "bake" (105 here today and going to do enchilada casserole on there this afternoon)....I can pretty much dial it in and get a steady temp and not have to worry about it.