Works fine. It crashed once but I guess that happens with corrupt fonts. Loading fonts is not too slow IMHO as FontVista by Morrison SoftDesign is even slower.
Installing fonts as you go is nifty but of course it would be better if this thing would communicate with font managers (like Font Explorer) and generate its own set within FEX. Displaying only one face of a subfolder is not a problem but I wish I could open subfolders by hitting arrow-right (as you can move between fonts with arrow-down and -up). Might also be nice in logowork if size would go up to 200pt.