I just swapped out my stock 120mm stem for a shorter (110mm) stem after a year of riding. I couldn't believe the difference I felt immediately. It is almost inconceiveable that it took me this long to realize that my stem was too long....it felt so good when I bought the bike, but now it is so much more comfortable and doesn't leave me with stiff shoulders. The main issue for me was the length of the stem and not necessarily the rise, but they even managed to maintain the same rise. Props to my bike shop for replacing a year old stem and swapping it with a brand new one for nothing.