I had great success with the Whiz first time out of the box--when I was in my underwear only. Didn't have success in jeans, but I stopped practicing because I couldn't get the thing to look natural as a packer.
I have a medicine spoon that I haven't carved up yet. Don't know if I ever will. I'm lazy.
Haven't tried a nipple.
Haven't tried non-packer options, although I used to use a salsa lid many, many years ago. It worked okay, the excess pee shook right off, and I could slip the lid into my pocket. The P-style and other devices look too damned big. If I can't have a good packer STP, I want something small and discreet.