well, i bought a swift folder for commuting purposes and while it's really a nice bike (quite impressive, actually, for a foldie), make no mistake as it simply cannot replace my fixie or my roadie. as mentioned, much of this is due to the tires, gearing (though i did compare with roughly similar gear inches), riding position (not as aero on the foldie due to wider bars, but otherwise reach and saddle height are pretty close) and drivetrain (1x8 on the swift sometimes results in ghost shifts and there's always going to be some cross chaining).
so, while i like the swift, somehow in the back of my mind i can't help but feel a bit disappointed that it wasn't able to replace my fixie or roadie.