Got one. Also a Smith 686 in 4 inch barrell. The action is smoother with the Smith, but good with the GP. Fit and finish, including the quality of the sights is also better with the Smith, but also quite good with the Ruger. Both point and feel good, at least to me. Advantage to Ruger KGP141 is cost, about $100 less than the Smith.
I would not hesitate to pick up the Ruger rather than the Smith. The difference in price does not, in my opinion, justify the additional cost of the Smith. The Ruger shoots well, functions well, is reportedly stronger than the Smith and is very accurate. I cannot tell any real difference is accuracy of the two weapons.
Just for info, I bought the Smith when they first signed "THE AGREEMENT" . I thought that they would eventually ruin their handguns with 'smart gun' technology and purchased several Smiths on speculation that when you could no longer get a traditional Smith, I might make a few dollars on the collection.
I bought the Ruger to shoot!!!