Owned a 1982 CBX for 15 years - sold it about 4 years ago. Loved it. My brother has restored dozens of CBXs and is a wizard at keeping those 6 carbs tuned. If you are in the market for a CBX I know of several for sale.
Once I managed to push my old CB750 to the edge of its envelope, I wanted to try the CBX, never got the chance, they were rare as hen's teeth when I was finally able to afford one.
I started this vid in the middle, but it's good enough to watch the whole thing. The idea was that the CBX was just too much of a bike for the market at the time. I remember clawing my way up the FDR in NYC one morning on the CB750, kind desolate, and that unmistakable fighter jet sound of the CBX screamed past, like I was standing still. It wasn't loud, it was closer to the sound of a sewing machine than an 11-some second quarter mile bike. Kinda remarkable that you can still source some, some guy in Denver has been looking for CBX components for a bit.