I have tried several, the ramen recipes are fantastic, and although they do aim for home style cooking (which is different from restaurant cooking), they definitely measure up with ramen I’ve had in Japan.
More than the recipes, JOC teaches how the dish is composed, meaning it’s very easy to the make your own versions with locally available ingredients and substitutes.
I don’t think I’ve found a better resource for Ramen yet, including the videos people link. What would you recommend for the best recipes?