I'm biased. I hate my luck with weapon rerolls I wasted like 40 notes rerolling my Fulcrum and it's not as good as the original perks.
The only being more fickle than loot drop RNGesus is weapon roll Devil
So I'm sure I'm in the minority. But I feel that if you like the perks well enough then save the notes.
Unless you're going to upgrade it with Etheric right away then just level it up normally and see how it goes
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Agreed. Every time I get something that's pretty good and re roll it again, I end up getting shitty rolls for DAYS.