I've heard so much shit about these...great for the serratus, bad for the rotator cuff, you should do it on a decline only, limit the ROM, go for a crazy stretch to the floor, high reps, low reps, breathing reps, ribcage expansion (wtf?), targets chest, good for back, straight arms, bent elbows, isolates the serratus etc.
What's your take on these? How and where would you use them? thanks