The built in-knife is pretty cool. It is especially handy if you climb in less traveled areas where anchor webbing often needs to be replaced. It cuts away old tat quickly and makes it impossible to forget your knife. As a nut tool, it has a good curved shape that helps it get at funky nuts and hook walked-in cam triggers. It is in the middle of the pack as far as hook profile for retrieving small nuts. It wasn't quite as good as the Wild Country Pro Key but slightly better than the Black Diamond Nut Tool. While it doesn't have extra metal specifically for hand pounding comfort, the knife lines up relatively well to make it a slightly nicer experience than some.
Because you need to keep a carbiner clipped in to keep the knife from accidentally opening, it makes pounding with a wall hammer or your palm more difficult. When you take the 'biner out you do risk the knife opening unintentionally. We did not experience this but it could happen. Even with the carabiner removed this tool wasnt very nice to beat on with a hand, again falling short of a nut tool with a more specifically designed surface.
The Trango Shark is great for anyone who might already have a separate knife on their harness. The Shark is also a great option for folks who climb in less popular areas with generally long routes where you might have to replace old webbing or put new cordage on rappel anchors. Or if you climb on longer routes where backing off is more than just a small possibility and you will be forced to leave gear and cordage as you retreat downward.
One of the primary reasons to buy the Trango Shark is the fact that it comes with a knife. Anyone who climbs traditional routes and carries a knife can benefit from this 2-for-1 nut tool. At $24.95 this is not a bad price if you were considering both a nut tool and a knife. As just a nut tool it is on the more expensive side, but you really have to view it as a nut tool and a knife.