'Usability after having one for a while'...
As a Paramount user, I am mainly intrested in how it connects to Software Bisque's TheSkyX. After some waiting I can now confirm that it does connect and works a treat!
Going beyond the Canon menus and hardware layouts that you describe above, connected to TheSkyX I can now image link all across the sky, capture PEC data, program a series of shots with delays and capture data via three acquisition modes. See this blog for details:
http://www.bisque.com/sc/blogs/seeke...r-imaging.aspx
I am also VERY fond of the EOS Remote Utility. For rough focus adjustment the 200x live view zoom is just fantastic. This really gets things in the ballpark before commencing a focus run with RoboFocus and @Focus2 program (within TheSkyX).
Moving from a little Nikon D40 to this I really can't complain, but my use is also quite specific, unlike you pro photo guys who want all the jazz for your daytime and nightscape shots.