One other thing that should be taken in to consideration regarding all the hype about smooth twist barrels is ease / cost of manufacturing. If they are (and the hype says they are) just externally formed without dies / cutting tools etc the speed, and therefore cost, of manufacturing will be greatly reduced.
When it comes to profit wording can be manipulated to mean a lot of things
Regarding all the articles about smooth twist, I would take it all with a pinch of salt at the moment. All the reviews and articles so far (that I have seen) have been in magazines and magazines rely on advertising (both current and future), read into that what you will.
I've never seen a smooth twist, let alone tried one, but when I do I'll bear in mind that there's a lot of external forces that can / will try to influence peoples opinion of them.