I should start by saying the new Roubaix replaced a 2012 Roubaix SL3 Expert. That bike has served me very well, but after 15.5K miles I felt an upgrade was due. The improvement between these two bikes is even more pronounced than I had initially thought it would be. The eleven speed drive train is both smoother in action and provides a closer ratio between shifts than the 10 speed from the earlier design. Both of these bikes are considered endurance bikes but the future shock is just amazing at smoothing out the bumps and jolts in the roads and trails I ride. The biggest change I have experienced is the lack of hand and wrist numbness after riding about 30 miles. I have ridden the new Roubaix on two 40 plus mile rides and one century in the week I have had it. This lack of numbness just continues to amaze given how common that problem is on most bikes. I am sure the future shock is part of the solution to this issue, but I believe the geometry of the frame has also been adjusted and may also be part of the reason for the vast improvement in riding comfort. The frame also seems to be more stable than the older bikes. I am still getting used to the seat. The old bikes Toupe seat had my sit bones tattooed into it and was very comfortable. I think this seat will eventually become part of me. The last thing I will mention is this bike IS faster than the old one, even though it weighs about two more pounds. Emotionally, I wish the bike was lighter and if you pay more money they do become lighter, but it is faster. Go figure. The new bike is indeed an improvement over the older one, just as it should be.