I've been using SpeedScriber pretty much for every project I do now. It's an enormous time-saver for those of us who make interview-centric videos. Martin is also incredibly responsive.
Nice review. I've been using clip-based transcription, but I'm going to have to look into round-tripping. It seemed a bit complicated from the outset, but ability to select audio channels would be really helpful with accuracy. I've also had weird timecode issues with C200 files, which apparently this workflow would address. It would also allow me to work with MP4 files directly as opposed to rewrapping into .mov.
One Man Band (If it's video related I'll do it!)
I work for an institution that probably does not want to be associated with my babblings here.