If you never find v3, you'll come out ahead for every Quantum that you find from then on. So now, you have 30 Quantums and can still make 60 grenades. If you give 30 Quantums to Sierra, you'll get v2 of the schematics (2 grenades for each time you use the workbench). Say you have the v1 Nuka Grenade schematics and 60 Nuka-Cola Quantums. Worst: The Nuka-Cola Challenge actually works against the number of grenades you can make, unless you're obsessive about tracking down every last Quantum. However, I love the fact that both sides are ultimately 'evil,' and neither end is morally satisfying.
The quest is sort of a pain in the ass, depending on how you do it, especially if you're trying to max out the rewards from that, You Gotta Shoot 'Em In The Head, and Strictly Business (because the players in all three quests are interwoven).
