I have bee pleastantly surprised by the versatility of the slingshot. I have tested it on many things "just to see", including dips, pushups, incline, db work, etc. I'm not saying a person should, but its interesting. You might have to do 50 pushup sets for it to matter but it was sorta cool just to play with it and see.
my shoulders come and go, if I take time away from dips or pull-ups, the first couple days can be a little snap crackle and pop, but if I keep them into routine it doesn't seem to be an issue. I think doing a lot of lat pull-downs has helped my shoulders again feel healthy on pull-ups, and a lot of the hammer strength dips have helped me feel pretty good on the dips again. but fwiw if I open a set up of either pull-ups or dips at bodyweight and say 10-15 reps, I bet my first rep is like 1/3 ROM, then long and longer until my last couple reps are full ROM and paused/TUT. then the sets that follow feel really good for full rom, personally.