I never rode mine to work, but back in my racing days I spent a lot of time on my tri bike. The reason I never rode it to work is because it was incredibly ill-suited toward that purpose: No room for racks, and such an agressive forward position that a backpack or courier bag would have slid up toward my shoulders.

I'm not saying it can't be done. I'm just saying that there are a whole ton of other bikes better suited to commuting.