More videos on the internet combined with additional training materials is key.
Prior to the past few years, the only materials out there were some very old "IPSC Secrets" VHS tapes and the "Practical Shooting" Matt Burkett DVDs. You would have to dig through post after post on BEnos and hope you didin't get horrible advice.
Now you have all the Ben Stoeger stuff; Steve Anderson dryfire, Mike Seeklander competition training, the "Make Ready with..." videos, etc. You can spend days on YouTube analyzing performances, gear, tips, etc.
For me <startnuthugging>, Ben's materials (videos and books), website, forum, training with him, and podcast has done more for my performance than anyone else. No other "top shooter" out there compares.</endnuthuggery> Capitalistic Bastard! Take my money!