Back to JJ's excellent post (and it is a very good one), I still think when the TSX works (and it usually does), it works darn well (though likely in truth, not really that much differently than a dozen other bullets) and when it fails, it REALLY fails.
If I want to shoot solids into an animal, that's what I'd pay for. The argument that even if they don't open, they maintain their weight acting like a solid (they actually don't as they tumble), I just can't buy into. But that's just me.
