Nothing but speech?

I've read three dialogue only sf stories over the last little while. They all have slightly different conceits and approaches but have no text markers save for section breaks or denoting a speaker. It sounds like the kind of experiment that should go very wrong most of the time but have possibilities within the constraints of flash to shorter-short story word lengths. 

So, dialogue only stories: Do they work? Do these?

Judge - James Will Brady
Ideomancer -

Geoffrey W. Cole - Michel "The Meteor" McLure
AE Scifi -

The Pleasing Shapes - Franco Raud
+Kasma Science Fiction Magazine   -
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