I just replaced my Criterium with SX610. The criterium is still good but I bought the 610 to have on the shelf as a spare and had to try it. It is actually a better shifter. And it looks a lot cleaner. It reminds me of the Criterum when it was brand new in 1973 the way it shifts. And it stays on, the Criterium is my on the spare shelf now. I also upgraded the Criterium FD to a SJA 102 because the plastic clamp broke on the Criterium. I have a spare cage for the Criterum now.