Installed the Kawasaki solo cowl today.
First, it is quite a few pieces to assemble:
Comparison to stock seat:
The weight difference is 4.7 oz lighter for the solo cowl.
You can't swap freely between the two, because you have to install this bracket:
The bracket is a bit of a pain to install, because there are nuts you use on the bottom side. Easy to lose one.
Installed on bike:
I am kind of on the fence with this mod. It looks pretty good. It is a bit of a pain for the install. And, really, you are only losing 4.7 oz of weight...because you can remove the pegs/hanger anyway. Then you can always reinstall them really quick if you need to ride a passenger....without dealing with that new bracket. Cost was $159 with free shipping, off of ebay.