What, no, those things are god-awful. It's not worth running them over even 40% because of the loss to base Atk. This might not apply to newer players who are not running double/triple +99 Tiamats, and also might change in December when they buff the currently-120% Eidolons. But for now, fuck the 50% PoS Eidolons.As dreamlitz pointed out, yes it is. Assuming that there is no great cost to getting it, such as SSR Diabolos.
Cu gaining 10% Special Attack per triple is just... god amazing, since 3-6 stacks is easy to get and then she's a fucking MONSTER
Not that gaining a passive 30-60% Assault/Elem is a joke either, but it just isn't as good as Special Attack.
Uuuh so yeah, on topic, the 45% one. I hope that is Amaru instead of a 1-Star Huanglong, but either way.