I'm a big ANTI-RIP on here. Tested it, tried it, jammed it, hated it. It's more of a gimmick then anything. It's a good sales pitch, but you don't get what they promise by any means. Pathetic penetration, terrible weight retention, weak against obstacles, and a legal nightmare. This bullet is likely to do little relevant damage, and the "shrapnel" is pointless unless you're intending to let your attacker kill you after your make them very angry. I cannot say enough against this ammunition.
Listen to TAM and AndyC if not me.
1: It's effective for our intended purposes.
2: The legal drama you may get from shooting somebody with a bullet that is "designed to mutilate," rather than stop a threat, is possible to be worse than what your attacker might have done.
My suggestions, in proper order:
1: Critical Defense
2: Gold Dot
3: HST
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Can't go wrong with those!