The Trango Shark has a unique feature: a small knife perfect for cutting webbing or cordage. So while this does add to the weight and make it expensive, it also means you don't have to carry or buy an extra knife. If you always bring a knife when you climb, then the Trango Shark should be on your radar. And don't worry; as long as there is a 'biner clipped to the nut tool, there is no way it can open accidentally.
The Shark is also a great option for folks who climb in less popular areas where you might have to replace old webbing before the ASCA gets there to make it safer and put new cordage on rappel anchors. So despite its $25 price, anyone who carries a knife can benefit from this combo deal. Beyond the knife, the Shark cleaned nuts better than the DMM Nutter but not as well as the Wild Country Pro Key. It wasn't very nice to beat on with a hand but it wasn't the worst, either.