Let me start out by stating that I love S&W revolvers, although I have only a few examples, all large bore and a 617.
I have 2 DW's and I will state that they are the BEST double action revolvers that anyone can purchase off the rack. I am NOT speaking of these revolvers in the self defense arena, I'm talking accuracy and durability. I'll relegate the best single action revolver to Freedom Arms, likewise, off the rack. I used to shoot silhouettes, and I'll be Gdarned if anyone can show me a revolver that will outperform a DW in any aspect, unless it is price, which means little. You can buy about 1.5 Ruger double actions for the going price of a DW, but you will NEVER match the performance of the DW. The S&W 500 Mag is a .500 Supermag, designed and tested by DW long before S&W started making it's current line of "compromised" revolvers, not to mention the fact that the .500 uses DW technology to hold the revolver together. I've seen, not heard about, groups shot by .357 and .375 Supermag revolvers that where about 4" at 200yds. I'm not saying average shooters did this with factory ammunition, but I challenge anyone to produce a factory revolver capable of this accuracy level, at any cost. Lets not forget these groups where under 5" at 200yds with factory iron sights.
I've pounded the heck out of my first revolver, a .357 DW, and it still will outshoot any S&W or Ruger DA I've ever seen. This is a revovler made during the years of "questionable" quality control. I like most revolvers of decent quality, but I've never seen a revolver that can compare to the accuracy of a DW. You'll spend $1000+ to make a Ruger, or S&W, shoot as well as most DW's do right out of the box with a factory trigger job. I guess the realtivley high price seems more reasonable when that is taken into account.