I have the tool and use it a lot, most of my clamps on my cars are oetiker at this point. Even on steering rack boots!
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Fuel lines:
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Re-freshed all vapor lines, looks factory original, etc. I've also moved to constant tension clamps everywhere I can.
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Here's an action shot of constant tension and oetiker on the fuel pump low pressure side:
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And all my coolant hoses are now constant tension:
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Looks great and way easier to deal with than the old school worm clamps that chew into the hoses.
You can use wire cutters on the oetiker clamps in lieu of the official tool, but they should be this type:
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That's basically what the tool looks like anyway, it just adds extra mechanical advantage. I use to use an old set of these that I "took the edge off" so that I didn't inadvertently cut through the oetiker clamp. Works fine.