Adding on to this thread my experience with a 58cm Fantom Uno I bought a month ago from bikeisland.com:
Supposedly the geometry is the same as the Messenger but the size 58 top tube is 56.5, not 57 as on the geometry chart and the standover is 810, not 827. This bike is actually smaller than my 56 Steamroller.
Since the seat is way up above the top tube, I've had to put an extender on the top of the steerer to get the handle bars up and put on a 130mm stem. I'm 5'11" with a 34 3/4" inseam.