I'm interested in the hub, Dynocoaster. I mention Mezzo as it seems the hub is still in use for those bikes only, and I figured there must be Mezzo riders on this forum who have the 4 speed model and can offer opinions on the hub.
I guess that means that the weight disparity, 1700g for coaster vs 1370g for roller, is due to the fact that that doesn't include the roller brake unit. . . in which case it's not a particularly light hub.
But otherwise it does sound good for folders; evenly spaced gears and allowing the usage of a small chainring.