Magnificent! Truly greater than the sum of its parts.

Quite excellent. I have a dryer palate than most, so I only use 1/4 oz (half of what the recipe calls for) of 1/1 simple syrup, and I thought it was perfectly balanced for me. If you think an equal part Negroni is too cloyingly sweet, than perhaps try to cut down the simple as I did?
This hits all the right notes for me: it is quite booze forward, it's complex due to the sweet bitterness of the Campari mixed with the acidity of the lemon, and the egg whites brings a beautiful mouth feel. A winner.

Very tasty! Mine needed more sour, as the bitter was too strong. I added a touch more lemon, bringing it to about 2/3 oz total. The color is fantastic. I gave it a long shake, maybe 2 min with ice, then 1 min without. Feels elegant and sweet but delicious

Even with Aquafaba, this drink is decent.

This cocktail is a great example of squisite balance, with none of the elements (spirit, sour and sweet) prevailing over the others, but all are clearly there. Delicious.
Notes: I have abundantly expressed the lemon peel on the rim of the coupe, and then speared it on a pick so it could hang above the foam, which provided an intense lemon kick to the nose. Also, lacking orange bitters, I used a mix of Angostura bitters and homemade grapefruit tincture.

Very satisfying drink. Love the colour. Next time I might try increasing lemon and/or decreasing sugar.

Also, do my eyes deceive me, or is that an orange zest in the image?

Very nice! Still on the bitter side even with the 1/2 oz of sugar syrup.

This is delicious!