Everyone needs to own both of them IMHO! I now know why I had less than stellar results from my Feather A/C. These DE's require the lightest touch and I was treating my "straight" like a 33/34C.
It is so much fun shaving with these! I don't necessarily have a heavy beard but I thoroughly enjoy learning the skill of using such precision instruments. I've always had a problem with irritation around my neckline but these razors have solved that issue. It may seem counterintuitive (sic?), but using these has taught me to use the utmost care. I'm confident I could get the same results from my first DE - a 33C, but it would not be half the fun.
I may take some getting used to, but I highly recommend you try one or both if you haven't before. I love these things!!