I've used it since it came out in 2004. I move it around some, but keep it between cheek and gum either left or right side. I've never used even a snus portion under my upper lip. That feels funny to me and I immediately move it to the side.
Stonewalls leave a residue where they dissolve, so keep that in mind. That's one reason I move them around. You don't want a build-up in the same place all the time.
I dissolved some in vegetable glycerine once, to see if the liquid could be vaped. Nope. The residue at the bottom of the vial was a good quarter-inch thick! The liquid did not taste good and had no nicotine kick.
But I love them for use as intended. I'm a five-pack a week (20 per pack) Stonewall user.