So, i ended up with two different STP devices thanks to a misleading delivery notice.
I have the Pibella (arrived yesterday) and the pStyle (arrived today).
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The Pibella is packaged and presented as female urination device to be used by women. Apparently it's used in some medical contexts as a replacement for a catheter. It's literally just a spout that you place over your urethra and pee through.
The pStyle is a more traditional taco shell looking thing that you cup under your vulva. They feature trans people on their website and don't mention gender-specific use anywhere on the packaging, they just call it a stand to pee device.
The Pibella has the greatest instructions ever: "insert tongue into the vagina". Since i pretty much gave up on sex, i haven't had a tongue near my vagina in a long-ass time. I almost forgot where it was. Then i peed on my pants.
Folks, you gotta get the positioning just right. The way it works is the tongue goes against the front wall of the vagina, then the rest of the opening is supposed to fall into place around your urethra. You let the labia close and it forms a seal. Six pees later (pants removed) i have had three hits and three misses. Not gonna lie, it is fucking glorious when you hit. It feels so badass to just grip this pen-shaped tube and pee your heart out. There is no problem with flow - if you get the seal just right, it takes it all.
If you get the seal just wrong, you better have good bladder control or you will soon have wet thighs.
One trick that i have found so far is that it's better to stand with your legs together than spread, which is a strange feeling. I guess having your thighs closed gives it a better seal. I actually think this one might work better with people who are carrying a little more weight than my skinny ass, just to keep it in place.
The pStyle is much harder to fit into your pants. I got it through the zipper and cupped around the vulva, but it really felt like shoving a ladle up in there. It does not make you feel like a badass pee warrior. It just makes you feel like you have a pee funnel in yer pants.
But. It worked first time. No muss, no fuss, no worry about positioning. You stand with your legs spread, just like a dude, and it makes sense because it's presumably better to have the labia spread to keep the stream centered.
So first impressions, just from the unboxing and first 24 hours, pStyle is the clear winner. However, i think if you have time to practice and get good with the Pibella, that's probably a more portable option. It's definitely more discreet.