I first head of those a few years ago, Richlacal, and every year when we winter camp, and every time a get a not so comfortably placed mosquito bite, I wish I had one. You guys can use a well sealed, well labeled bottle in the tent right? That could have it's advantages.
I cannot speak for others; being able to whip it out or not is not an issue for me.
Jeanette Isabelle