Well, I am a newbie to this biking business, but my Fuji Roubaix has Suntour GPX running gear, and it is great. My Sagres has Shimano, and I find that the Suntour shifts much crisper than the Shimano. Even when shifting the front chainrings, it shifts without hesitation going either up or down. Just my humble opinion, but I think the Suntour is nice stuff!!