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This is probably great for a full length knife - it isnt so good for my folding one. The straps tend to get in the way and get tangled which is what you are trying to avoid by carrying a knife in the first place. On the plus side it has decent length leg straps which means you can attatch it anywhere from the calf to the thigh. Slips a little over a wetsuit so keep it tight.
The is just what you need for a backup to a dive computer. Its clear display makes it easy to use underwater and still be nice enough to wear on dry land too. It seems very robust and doesnt appear to scratch easily.