The organic, natural I've bought (at the health food store) doesn't have any of those additives, and is certainly not sweet - almost a little too cheese-y for my taste. I had to really doctor it up with stevia, cinnamon and fruit. i'm not sure about the fermentation time, but based on the more sour quality, I would suspect it's a longer ferment. My kefir is pretty sour on the first ferment (24-36 hrs), but if I double ferment it (leave it at room temp for a few more days with a shake twice a day after I've removed the cultures), it gets really sour, but supposedly dramatically increases the B-vitamins. Lactoferrin is supposed to also be a healthy product of kefir-making. Have you seen Dom's kefir site? Everything you could ever want to know about kefir...