To the pistol... I will say that it lends itself best to shooters with large hands. I have large hands and when I picked up my 659 for the first time, I almost did a double-take. It is one seriously FAT chunk of handgun. Because of the condition and price and because I simply love S&W metal pistols, I had to own it but I literally went in to it quite unsure if I would enjoy shooting it.
Happy ending to the story...
I still think it is extremely pudgy. And if you swap it in & out of your hand with a 5906, it will give you an immediate appreciation for how well S&W (and Wayne Novak...?) set to work on ergonomics. The 5906 is absolutely the evolution of these and you can see and very much feel it.
But I found that I took to my 659 immediately and it is a joy to run on steel plates. I still think it would benefit from a strict diet & exercise, but I definitely love shooting it.