Couldn't be happier with the product! I've never used an STP before, but I started using it as soon as I got it and have yet to have a single spill. I wasn't sure if using an STP was going to radically improve my life or not, but as a transgender man with severe bottom dysphoria, I found that it makes me feel normal on a deep and personal level. I mean, in my dreams I no longer think about being transgender at all-- I just *am* a man. So it's clearly worked something out in the deeper recesses of my brain. Aside from that, being able to use the men's bathroom in a pinch is really invaluable.
It is EXTREMELY light, which ultimately wound up being a huge plus for me. My other day packers are fairly heavy, which has resulted in some discomfort but also simulated the presence of a penis and alleviated dysphoria. When I noticed how light the STP was, I wasn't sure if it was going to help with bottom dysphoria, but I've found that the absence of weight combined with the presence of something between my legs alleviates dysphoria without causing an uncomfortable pull.
Once again, the realism has surpassed my expectations. I mean it just looks like I have a penis, straight up. The head appears to once again be partially filled with gel to give it the feeling of a cis penis head, and overall it looks extremely realistic (with the exception of a large urethra to allow for urination without risk of spilling).
That being said, I should bring up some things for those of you who are considering buying: The urethra is bigger than I've ever encountered on a cis penis in order to allow for the urine to pass through it without issue. This isn't a problem for me, but just keep that in mind appearance-wise. Another thing is that due to it being hollow to allow urine to pass through, packing down will cause it to have two ridges on either side of the shaft since there's nothing inside to give it the consistency of a cis penis. This is exactly what I expected and I take no issue with it-- the ridges aren't visible through pants and I think you'd have to be wearing spandex for anyone to notice, but I just thought I should point that out for anybody who is wondering what it looks like.
I have yet to use this prosthetic for intercourse because I own a different emisil prosthetic (as well as a few others) that serve that purpose fine, so I can't review its functionality in that department.