I found the darts do not fly as true as the target or hunting dart. The wind affects them much more and they are slower so you can watch them curve. However, a little Kentucky windage and you can still hit the vermin.
They are the indoor answer to the actual steel darts. The stun darts are basically plastic plugs that are maybe 3/4" long. Their good for practice and I'd compare them to a wadcutter bullet that you use for target practice with a pistol. They work indoors because they wont stick in the wall if you miss the target (yes I have missed).
Got them for a nuisance animal, they work but only for about the first 20 feet, then the flutter and die. Not enough weight to them I suppose. But all and all Iwould buy them again