Just got done trying the DRT ascent with 2 RRs (Kevin's video) and then just one RR.
At the bottom it's a bit tough trying to get the opposing rope that you're stepping on through the RR but once you get up a few feet the rope starts to fall through nicely. Once you get going it feels like you're skipping two-three steps at a time, which that's the kind of person I am, I rarely go up steps one at a time.
As a simple ascent method of just adding an additional rope (DRT), one RR and two foot ascenders is pretty sweet. It just takes a little more time putting an additional rope away, but the advantages of your feet on two separate ropes and being able to take big steps I think is worth it.
Now the hard part, trying to figure out how to use DRT once I'm in the tree.