No offense to the opinion of anyone else on this topic, but for my purposes, the slab-sided S&W barrel is an abomination. That leaves more available for those who like the look. To my eyes, the slab-sided barrels do not match the graceful appearance of the lunette, and the look is, of course, non-traditional. I, for one, appreciate tradition.
Also, my suspicious mind tells me that machining a slab-sided barrel is easier and takes less machine time. I do not know that for sure, but I suspect it, and by my way of thinking, that cheapens the revolver and its appearance.
If, for example, Colt re-introduced the Python with all of the hand-fitting and attention to detail as it was at its pinnacle, but they made the barrel slab-sided, but otherwise still with a ventilated rib as before, would any of you Python people like that? Well, I don't like it with S&W either. If anything, the supposedly more careful attention to detail of a Performance Center gun calls for a traditional appearance.
Just my two cents. If I wanted a Chiappa, I would buy one of those.