Bests & Worsts Reviews from Amazon

I bought these last summer, and wanted to add to my post to remind people DO NOT BUY THESE!!!!!!! Before you buy these, go to the one or two star reviews that compromise over 50% of all reviews . They all have same issues and battery or unit suddenly stop working shortly after purchase of this item retailing between $400-$500 ! I have three of these...returned one and all (3) quickly stopped working , including the replacement,last summer after limited use. I reached out to Yamaha with no response last summer and even after all this time,I am still shocked and dismayed Yamaha puts its name on this product and does not stand behind it, other than limited return time,and seems to have zero direction in fixing these ,when problems occurs ,after return frame . ONE OTHER IMPORTANT NOTE ON THIS REVIEW. I BUY MUCH MERCHANDISE ON AMAZON AND NEVER GET ON HERE TO LEAVE ANY NEGATIVE REVIEWS, BUT MY DISGUST WITH THIS WASTE OF MONEY ILLUSTRATES WARNING TO AVOID BUYING THIS PRODUCT