My IRO is a commuter and workbike - very, very different from a road bike. I've had it set up as a fg road bike, but riding it like that is unrealistic considering the size and content of what I carry for work, so closer flat bars are what I need. I also have clips and straps, having finally come around to laid back riding and placing a priority on walkability in my shoes (I've worked all day in clipless shoes and do not like it). If my life were different - different job, different city - this bike would be kind of obsolete. I'm probably going to swap it for a cross bike that can do more double duty - geared, fixed, knobbies, etc. Year round commuting, autumn racing.
My Felt is a track bike. It's for racing and fixed training. I do plenty of 30+ mile rides on it, but most of my training is on my road bike, since, well, I'm training for the ongoing road season.