I have 2 Aimpoints, and they are the best red dot sight available, in my opinion. One is on a long barrel Smith #29, the other on a Smith #41 target auto. I dont have the 2x version, but I bet it would work fine. I also have a Burris Fastfire 2 mounted on a 45 acp, and an Ultradot from the 1980's, mounted on a 44 mag Redhawk, and still going fine. I will say I am impressed with the size of the Burris Fastfire 2. Small enough to mount in the rear sight grove on the slide of a 45 pistol, it has proven reliable for about 600 rounds and counting. Have another on a AR-15 with several thousand rounds, also reliable.
Larry