Helps with severe muscle tension.
I purchased this because a colleague of mine has one and let me borrow it when I was developing a migraine from severe tension in my neck.  I only use it to combat my muscles knotting up- which gives me horrible headaches.  For that, it is 100% worth the buy.  I use it on my upper back and neck and it does wonders. It is easy to use and I love it.  My colleague is into crossfit and uses it after workouts.  He thinks it is amazing as well.  Well worth the purchase.
Rating: 5 stars