BCAAs typically only benefit (and even that is debatable) endurance athletes by helping them avoid potential catabolism from long duration cardio. It has little to no benefit in most other athletes, namely weight lifters.
The majority of supplements are bullshit, the only ones I'd ever recommend would be Whey Protein if you don't like eating a lot of protein otherwise, and creatine, which has countless studies showing it actually works.
RE: We might not need BCAA supplements after all.