KTM AER forks, air spring on one side, damping on the other. Older, Yamaha YSR50, spring only on one side.
Showa Separate Function front Fork [SFF] With a pressure separation damper on one fork tube and spring mechanism on the other, functions are divided, resulting in both high damper performance and lighter weight. This is mainly adopted for motocross race models.
I would gauge measured success by the number of manufacturers that have followed suit. To my limited knowledge, that would be virtually zero. My YSR is converted to a two-spring fork. KTM AER? Never even heard of it 'til now. There are common examples of forks where they split the damping duties to individual fork legs, compression in one, rebound in the other, but I don't recall with any certainty who has done that nor whether routine front axle replacement becomes a thing. Mind you, I'm not talking about only one fork with dynamic spring loads where, for sure, that axle is getting severely tested. That Bilstein shock looks retarded. Like a desk jockey got the job of designing them. "These are supposed to be adjustable? How can you even do that without tools? Let's make the knobs big enough to turn by hand, cuz, if they're adjustable, they must be adjusting them all the time, right?" <rant> Who needs adjustment knobs so big, as if the rider was gonna be tweaking them at every stop. Bilstein sells a lot of product, but I doubt this will take off without a lot of marketing. Like the Douchati riders at the RockStore that have the billet preload adjusters on their forks. To what end? It's a product for the ignorant masses..."Oh! Shiny! Me want!" Example: You need these! Easily keep your preload at its optimum setting without tools! See how shiny they are? That's so people will know you're the coolest guy in the parking lot. Even your shop specialist will appreciate the ease in which he can tune your suspension. PSA: Remember, fill the gas tank full when bringing the bike in for air filter and/or valve service...and our parts department can sell you anything! Need a bridge? BMW carbon wheels? Not being supported for catastrophic damages? (I've seen first hand what happens to these wheels if you miss your line and end up in the dirt). Don't even think about hitting a pothole. BMW? I like to think I'm a principled man and practice what I preach. You and I will never do business together. Amen.
That separate function fork above is Showa, used by many manufacturers. Also Aprilia RS250 had forks with one spring long time ago.