I have been using this method throughout my cloning "career" and I'd say I have an 80-90% success rate with it. I just take my cuttings, dip in cloning gel, and stick them straight in very light soil (~50% perlite or so) and put a dome on them. I have a neat little greenhouse type deal that I bought to start hot peppers. It works great for cloning. Then I mist the inside of the dome, and put under a single floro tube and within 2 weeks I've got roots growing out the bottoms of the pots. I mist pretty much daily, depending on what it looks like they need.

I've had a few die on me, but looking back at it, I think it was more because I handled them a bit roughly, and wasn't always sterile with my conditions.