The Buddy is very nice looking and my favorite in the looks department. Packing wasn't bad with it either, it just bulged out a little more than what I expected because It didn't sit very well on me. As an STP it never worked for me. The hole was way too small and the pee didn't flow out fast enough. I kept getting a lot of back flow and had many accidents.
You had to constantly make sure you dump it out because of the pee left behind. I never got the hang of it and gave up on it. Unfortunately mine went missing when I moved ;(. Everything is trial and error, so the buddy might work for you it might not.
Sport model was too small for me and I couldn't pack with it. It didn't work as an STP for me either, was also super stiff and uncomfortable.