My initial concerns relate to durability and mechanical complexity. If it's a complex solution, it may be more fussy to maintain. The Spyder's current suspension draws from many years of automotive suspensions and chassis design; it's pretty straightforward and thus easy to make sturdy and durable. Who knows? Maybe durability won't be an issue. Perhaps the solution isn't as hard as I imagine.

However, if the bike leans, you're right back to the relatively shorter life of regular motorcycle tires -- and now you have to pony up for three, not two. Quality motorcycle tires ain't cheap.

Finally, looking at those designs, there's no room for a frunk, so maybe the Spyder will retain the edge for cargo capacity. And towing ability.