My understanding is that it is a tool -- it lets you get used to locking out heavier weights than you could otherwise, helps protect your shoulders, and helps reinforce the groove.
I wouldn't expect it to be a miracle "increase your bench by 100lbs in a month" gadget, but I can certainly see how either the Slingshot or the Ram could be effectively incorporated into a program.
"Generally people can't squat because they're lacking in the 'lower ab' area. As in they need to grow a set." - LtL
"No one ever got big or strong by lifting lightweights" - Carl1174
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Valentin Konstantin Platz