Ambassadors Kizzy & Morty,
I got the Just Black version and put it in a Spigen Tough Armor case. I had that for the P2 and liked it. The Tough Armor for the P5 is definitely a bit thicker, but isn't a deal breaker.
Overall, I am very, very happy with it and the battery is a beast. The main reason I didn't hold out for the P6 is that I really like the fingerprint reader on the back. The sound is good, but I use earbuds when I listen to music so I'm not a good judge for sound quality. The camera is great for the few photos I've taken. There is still so much more to experience with the camera and phone.