I used easywdw for my trip last May because we were staying off-site and didn't have access to EMH. I have to say it worked extremely well.
Next time we're staying on-site, and since easywdw recommends avoiding all EMH parks, we won't be using that calendar as much. We like to hit morning EMH then hop to a different park around lunch time.
So if you are off-site or don't have park hoppers, I can recommend the calendar 100%. Just understand that his main goal is for you to avoid crowds, so if there's something special like Fantasmic happening that you must see, you'll have to go against the calendar's advice to see it.