I had tennis elbow last fall. I got it after holding too many fabric bolts in my outstretced arm!!! I couldn't believe how incapacitated it made me! I had some friends that had experienced tennis elbow, and they recommended buying the high end brace, as the mid range doesn't hold up as well. They also said DO THE EXERCISES! Little did I know how long it took to get over! I came down with it in Mid September, and didn't really get over it until the end of January. The brace lasted just about that long. I think if I had a relapse, I would buy a new one. To this day, I am very conscious of how much weight I put on that arm.
Good luck with yours!