Yes, I believe it to be popular especially if one looks at the number of "guests" reading the forum at any given time. It is usually more than 100 people.
To me it is still, by far, the best forum on Japan that I have participated in, and I have participated in many. There is a wide age range represented from all over the world and it is not relegated to one age group, like teenagers or one main topic like anime, or J-Pop, or bashing Japan. A wide range of topics and opinions are represented in a fair forum.
After 4 1/2 years, it is still the one I participate in.