I just blindly throw money at I9 because they make pretty colors and go bzzzzzzz.

Also they are stiff as $h!t, set up tubeless well, I can beat them up in Pisgah and not have to true them after, have almost instant engagement, and are almost universally configurable. oh did I mention they were pretty.

Also I don't usually notice a big difference going from a "normal" wheel to I9 but I notice what normal wheels don't have once I get back on one, if that makes any sense.