I checked out the 9-speed version on an F95 we had in for service--quite decent, a definite upgrade from Sora and just different (no better or worse) from Tiagra. The 10-speed version should compare favorably with 5600 (old 105). Regarding durability, though, it hasn't been on the road long enough for me to judge. There is an 8-speed version that Fuji used on their Newest 3.0 for a year. This one absolutely sucked. Microshift 9- and 10-speed controls have been on low-cost road bikes in the European market for several years.