I never heard of an SX3 but I suspect it is an upgrade on the old Super X.#1? People with setter's are generally honest, friendly, quite intelligent, are surrounded by beautiful womem half their age and they shoot a gentlemans gun, SxS's!
I have a setter, I'm honest, friendly, intelligent, but I'm not surrounded by beautiful women half my age because my wife won't let me date. I do have a few SxS's I enjoy though. 5 out of 6...
And the SX3 I suppose at 7 lbs is light enough for upland use - it weighs exactly the same as some of the double guns I have, and is a little lighter than some of the others.
And yeah it's a lot of money, but amortized over a lifetime of use it's not that much. I bet you'd go through 2 or 3 Stoegers before wearing out a Winchester.