If you have a use for the 500, I say go for it. Unfortunately though, half the people who buy them are trying to overcompensate for something, have zero use for the gun, and flat out can't shoot it well. Hell, I know guys that can barely handle a .357 without flinching, yet rave about how they just gotta have that new Smith .500. They buy it, shoot 20 rounds (never hitting the target because they flinch it 4 feet low), then it ends up in the used gun case down at the local shop for some other schmuck to repeat the cycle.
Obviously, I am not accusing any of you guys of this phenomenon, but it is the truth, ask any gun store clerk. Personally, I stick with what I shoot well, a .44mag SBH or a .454 Casull FA83. I have shot the 500, and it certainly is King of Power, but it is also King of Resales. I just don't understand needing a sling to carry my sixgun, I'd just use a rifle instead. These are just my opinions, but if I was fishing in Alaska and a big grizzly came charging my way, I wouldn't mind a .500S&W. I don't though, I live in the tame midwest like many of you.