I agree that lighter discs are easier to get up to speed, and for beginners, in general, they will fly further. I think they can be a bit trickier to throw, in that they might move around more in flight. Lighter discs are definitely affected more by wind, although, thrown well with the wind, they can add even more distance advantage. I think heavier discs are a bit more stable than lighter discs, which contributes to slow arm throwers getting more distance with lighter discs. With heavier discs, thrown too slow, they will get more of the hard, early dump left (RHBH). I have seen the first video before, and again now - it mostly confirms lighter discs leave the hand faster, and travel further, backhand. It also says lighter discs are nearly useless forehand because they flip over too early - personally, I only throw RHBH, so I can't speak to that from my own experience, but it makes sense to me. I will try to watch the other videos too. Myself, I can throw higher speed discs in light weights, but not at all in heavy weights. I throw them with reasonably good accuracy, get more distance more easily, and I do not use them to make up for bad form - I continue to work diligently on my form. I am a recreational player, and for me, the lighter weight discs and added distance make the game more fun! I play with a guy that throws faster than me, and for him, he uses almost no high speed drivers. He says faster discs get him no extra distance, and are a lot harder to control. So, what light weight discs do may vary from person to person, and you only find out if you like them by giving them a try! Personally, I love my 145-150g Terns, Shrykes, Corvette, Katanas, and Fission Waves.