I found out about Hu through Eckankar, I'm an Eckist.
Since I use it in different ways, the benefits vary. If I'm using it in contemplation I get a very uplifting, spiritual feeling.
If I'm angry, I'll use it to calm down and see things from another perspective.
It can also open my eyes to see things that I normally wouldn't be aware of. Something that was right in front of my face, but I ignored because I was too into other things.
It can be hard to explain. Hu is really something that you have to experience for yourself.
If you're interested, you can listen to Hu here...