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We have had pretty good success with this type of knife for UG works and they are part of most of our generic toolkits and insulated toolkits.
I have had good success with the old orange “D” type hand cutter for sheath removal only.
The issue is generally that OH covered PVC is considerably tougher and blades do not fair so well (plus most line mechanics don’t generally carry a gas torch in their back pocket) so the old faithful hook knife still seems to do the trick for most OH works, if, as you said, it is sharp 🙂