I just kind of stumbled on VHorns saxes today, too, while purchasing the VSL World Winds on the last day of the intro price. I was really amazed at the sound of the VHorns saxes, and picked them up, too (also last day of intro price for them).
I've had and liked SWAM instruments for some time, now, but for the moment, VHorns sounds quite a bit more realistic to me, especially when exposed. I can really hear the air in the instrument, and tonguing. Overall, there seems to be a MUCH greater differentiation in tone from soft to loud, and when things get loud, there's just a touch of the slightly unpredictable wild energy you get from the real thing (I play the real thing, but I'm mainly a pianist, and not a pro level WW player).
Definitely, I think these instruments need to be played with at least a breath controller (Hornberg works well).
Wonder how long VHorns will be king of the hill before another competitor knocks them out of the box. For $179, for a package of eight modeled instruments, I think it's a pretty good deal.