Tie the thicker end of the tapered leader to th fly line loop ith a perfection loop.
Tie tippet material to the thinner end if you prefer, saves you cutting into your leader to change flies.
as for the benefit, depends what you are using fly wise and what type of fishing. If you are pulling lures id stick to a length of level line its cheaper. for dries or more delicate flies they should see you getting better turnover.
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Around the steel no tortur'd worm shall twine,
No blood of living insect stain my line;
Let me, less cruel, cast feather'd hook,
With pliant rod athwart the pebbled brook,
Silent along the mazy margin stray,
And with fur-wrought fly delude the prey
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