At one point it definitely was helpful. I'm not going to claim it could make you fluent but I used it maybe 10 years ago to practice and I found it valuable. It

At one point it definitely was helpful. I'm not going to claim it could make you fluent but I used it maybe 10 years ago to practice and I found it valuable. It had long form explanations of grammar, exercises that required you to listen and type sentences as responses, and pretty useful forums if you had questions. I checked it out more recently and it had become much more superficial and I didn't find it worthwhile at all. It seemed totally targeted at mobile where everything was multiple choice and gamified. Maybe the good stuff is still there somewhere but I couldn't find it and quit.