The 945 is a gun that should have set the world on fire for S&W but somehow never managed to do so. I have two of the early production models, a full size (5") 'black' model and one of the 3.25" all stainless.
(Here is a photo or two of the latter.)
Both shoot extraordinarily well, the Briley-style spherical bushing makes for superb accuracy and the fit and finish are typical S&W Performance Center, i.e. superb!
Most people do not understand just how different the 945 (and the later 952 and PPC double stack guns based on it) are and assume they are just a modification of the 'normal' 1911. Wrong!
The basic construction is quite different, with a lock up system and barrel arrangement that is, IMHO, a 'step up' from the older design. See below:
The barrel is shown here:
The Briley style bushing, which makes for improved accuarcy is here:
I have shot the newest versions as well. Very nice guns. I also just acquired one of the newest guns in this line, the long, heavy slide 952 (6" slide.) A tack driver indeed.
Sorry for the extended reply, but I love these guns, no knock on my fleet of 1911s, but variety is indeed the spice of life. Dave