The 80lb injectors are factory LS flex fuel injectors that have been decapped. “Legit” I would say is anything that is not a clone. The Snake Eaters are obviously knock offs and it’s a gamble using them but they do get good reviews. Bosch, FICs, Deatsworks are a few that are pushed by the professional tuners.
I run 16 Holley injectors and am working on a project with 16 250pph AFIS injectors. Apparently they’re new on the scene. This guy switched from Billet Atomizers to these. https://www.hploil.com/afis
