With the Charles Frodsham Double Impulse Chronometer Wristwatch coming out last year, we now have a second George Daniels movement on the market, along with Roger W Smith's evolution of the Co-axial (and Omega's, but let's leave that for the moment). I wrote Nick Manousos of the NY Horological Society: How would you compare and contrast these two movements? Nick kindly replied: "As with all escapements, there are advantages and drawbacks. The advantage of the double-wheel escapement is that it provides two direct impulses to the balance in opposite directions. This means it is a self-starting escapement, unlike the detent. The drawback is that it is more complicated to build, as it requires two complete gear trains to fit into the movement, turning the escape wheels in opposite directions. The co-axial only needs one standard gear train, however one of its impulses is indirect, given through the pallet fork. This means that one impulse may have a slightly smaller amount of energy compared to the other. For all practical purposes this is negligible, and the advantage of not needing to manufacture and fit an entire extra gear train into the watch outweighs it." I've posted his answer with permission. What do you think?