Hi I've played exactly those openings for a couple of years. I find it's working rather fine. I have toyed with the thought of swapping so 1C contains 17-19 without doing something about it. The transfers after 1C is one reason, another is that you have a much greater chance of right-siding 3N after a 1C opening than after a 1D opening. 1D-1N-3N is an ugly sequence. After the transfer, we have two ways of showing 11-13 balanced: Completing the transfer denies 4c support, while 1N shows 4c support. I play inverted minors as GF, even after 1C. I like the idea of swapping the majors over 1D. Only trying it out will tell whether it gets too messy when opener has diamonds with a spade side suit. Cheers, Mud