I've talked to the reps about this one when I worked at Ribtor. Counter assault was the strongest spray, strongest meaning the most concetrated capsacin (sp?) content. The bear should be no more than five meters away in order for the spray to be "effective". Unfortunately, I think that no matter what the direction of the wind is, you will get some on you. So cover your eyes while you spray the bear! Just kidding. The stuff works though, if you actually have the guts to hold your ground and give him a full on blast to the face. I personally know people who have used it and had the bear rolling around, rubbing it's face in the dirt and thumping into trees. I hope I never have to use my spray though, I recommend you just make some noise...karaoke in the woods anyone! Oh yeah, keep it in a holster, or somewhere accessible. You can't dig through your backpack, do some hail marys, poo yourself, and spray the furball at the same time!