I like watching Lefty, great teacher, he comes across as someone who's students must feel they can do it when they take up their rods.
There are technical things I'd disagree with - like the thumb on top or behind as a principle - and if I cast forefinger on top so popular in Europe, or use Jason Borger's Three Point Grip that principle becomes....? Same with too many of his 'principles' I'm afraid, when you really get into it his explanations are not quite right.
Magnus