Being Plat 1 before I got my profile review, I was pretty sure Dylan wouldn't be able to teach me anything I didn't already know. I was wrong.
During the live session, he pointed out key areas I was doing poorly in that I had never noticed or thought about before.
After getting the profile review and taking on the recommendations, it took me about 100 games to go from plat 1 - Diamond 2 and I am now in the top 1% of League of Legends players.