Looked fairly realistic to a boyfriend of mine once.
as a staff person from an org that orders these STP's for people very often, the main feedback that i receive from them are that they are a great starter 3-in-1 ! people usually find they are great to start out using a STP in public, and find them to be a good size. as a person under 5"5 I find the SAM is a good size for my height and doesnt make it look like i have a huge boner all the time like other packers.
It works well as an STP, it's pretty easy to use. As for packing, it's not the best. It's extremely stiff, so if it gets displaced it tends to look like a boner, and if anyone happens to touch you you will feel rock hard. You pretty much have to fold it to pack with it.
They also have a harness that is apparently designed to work with it. It helps position it perfectly for peeing, but tends to be uncomfortable for packing.
Overall I like it and would recommend it, unless anything I mentioned is a huge dealbreaker for you personally.