I've had to a chance to use my 22" Cook Partner a couple times now and thought I'd add my thoughts...
Build quality is excellent and the ease of removing the burners and grate in one step is brilliant. Very easy to clean and you don't have to worry about clogging the burners.
I was in between buying the 22" or the 2 burner folding 9" stove with break away hinge. The break away hinge would allow it to be used with larger pans as well. The reason I decided on the 22" was the windscreen. However, a part of me still wishes I picked up the double 9". Why? The 22" is heavy (18lbs) vs 8 lbs. Not so heavy by itself but when added to a chuck box that is already heavy, it adds up. The 22" actually takes up almost 50% more room than the dual 9's when comparing volume.
Performance: The burners do seem to put out more than other 10K burners I've tried and I'd say they are adequate. However, I'd like to see slightly larger burners as the reason for getting the 22" was for use with larger pans/pots.
Heat control is okay. It is a bit difficult to fine tune simmer... especially when it is sunny out and you can't see the flame. Once you adjust the knob too low, flame goes out and you have to relight it. I prefer the controls on my Camp Chef with the 30k burners. The last position on the dial is warm/simmer and the dial will not go any further.
Lastly, I thought I'd go without the need for any carrying case as the stove doesn't really need any protection. However, on my last trip, I forgot the part about aluminum and aluminum oxide. Stove left some pretty good black marks on my beige seats (the back side). I gave it a wipe with some cleanser but didn't work. Not a big deal but others might care.