I got my Bug about a month ago and have really liked it. I have to switch between commuting by bike and car and bike a lot (kids in daycare), so this was a logical choice. I did want a pocket for my PDA, so I put a full-size carabiner on the key loop and clipped an old Eagle Creek organizer holder on it, which actually makes clipping my keys easier, too.
I might grab an Arkel Commuter someday, though, as the exposed hooks do worry me. I don't want them to dig into my wood floor, or into my car seat. Or maybe I'll find some way to cover them up myself.