I have a rotor stem, sx2, it is just a very cool stem to hold and wonder how it could ever be so light-just 100 grams of spanish cnc envelope pushing. I like things that are nicely made and fully thought out to the end of the requirement specs; this is one example. That gives it a sort of beauty in itself. Do I prefer t over a 1A? No, but it's the right stem for the right bike. Just go with the stem that was technologically the cutting edge at the time of manufactoring of the frame is my opinion.