My dad had it with great success, I had it on my shoulder with great success(after 2 years of on and off PT and a 19 year old injury!).

Dad tore a calf muscle, can't recall if it was gastroc or soleus, but he didn't know it at the time and never rehabbed it properly. End result about a year later had horrible PF. Ortho said only way to fix it was to operate after failed PT/stretching regimen and dad wasn't too keen on that so asked about Graston that I had used. Took about 10 treatments, but he is golden now. Occasionally he has to wear this boot thing to bed if he plays too much tennis, but his Ortho believes in it about as much as my Ortho believed in it;) They sure don't like it when people cancel surgery dates!

Tendon scraping isn't really a new idea and Graston is just another way to deliver it.