[tipperdog]

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More generally, you should be first to act on the flop and feel that you have no fold equity pre-flop, but some post-flop. It's also helpful if your hand has some showdown value.

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This is exactly right, IMO. Also key is when you have a hand that's vulnerable and your post flop push may induce a bad fold.

For example:

You have 77 in the BB with blinds of 100/200. You have 800 chips before posting. A loose raiser miniraises to 400.

If you push pre-flop, miniraiser almost certainly calls--and that call will almost certainly be correct. If you stop 'n' go, he might fold a hand like JK post-flop, despite having correct odds to call. But put yourself in his shoes (with a hand like KJ). If the flop comes Q83, and you push, that's a pretty tough call.

Of course, if he makes the "right" decision and calls, it's no loss to you. It would have been the same result as a pre-flop push from you anyway.