I have one of those unfortunate unruly urethras that won't let me STP, lol. It tends to spray in different directions and the flow is rather heavy so it can't keep up with STP. But I can't say, although I ultimately had no luck with the "nipple type" STP, I had worse luck with the medicine spoon.
That said with how cheap medicine spoons are, you have little to lose if you practice at home.