I carried a 649, loaded with .357's, for about five years. I replaced it with the "beast", my 340SC. The 649 is the most accurate snub I've ever owned. I bought the 340 because of the weight savings. It is a bear to shoot with factory .357's but I practice with my light reloads.
I had the plastic CT's on the 649 and transferred them to the 340. They made recoil extremely difficult to control. I upgraded to the overmolded rubber CT's and am very pleased with them. Recoil is still bad but the rubber helps to dampen it.
I'm happy with both the Sc/Ti Smith and the rubber CT's. My carry ammo is Federal 130 gr Hydra Shok,
John