So before I got chessly and worked on my Dutch I had a 34% win rate as black at the end of November. Now I have a 40% win rate and a really high win rate in the last month. I don't even have all the theory down by heart but even knowing where to place pieces and ideas to follow has improved my game a ton
Instead of being in a losing position in most of my Dutch games I now have a equal or winning position in most games. Well worth it in my opinion. The drills and quizzes also help me a ton in terms of actually understanding the opening