If one wants easy bar removal and installation you can also get something like this ITM model 700 clamshell clamp type quill stem....
I dunno, but I'm liking this ITM over my other stems now......
Here's another view of the ITM 700 next to other quill stems in my stash that have "alternative" bar clamp types:

From top to bottom, Mavic with dove tail jointed clamp, 3TTT with Titan Pantographing (It has a wedge tupe clamp), And the ITM 700 pictured above,with clamshell type clamp.
I think, mostly for aesthetic reasons, I just can't consider using threadless type stems on any of my bikes. Maybe after some years I might reconsider when they have more C&V flavor to them....

Chombi