I play a lot of pickleball and golf, and I really needed something to relieve my elbow pain from the activities of each sport that I love. I saw the ads for the Fiix Elbow, and gave it a shot. The rental was for 8 weeks, but it was amazing from Day 1! I felt it was working to massage and scrape the knots out of the inflamed area, the instructions that came with the device were spot on, including what to expect and how long each process takes. The ONLY problem I had with the machine...was that it worked too good! My pain was totally gone after week 6, and even though I tried to stick with the program for it's full length, I didn't need it on week 7 and 8. I have since returned it after the 8 week trial, but am now back to buy it outright, as my pain has returned after not having it for over a month. I love the device, should have just bought it from the get go instead of renting it, I would HIGHLY recommend buying it and keeping it for long term use. The battery life was amazing btw, great product!