Bought this for my son for christmas. I should of tried it first as when he opened it xmas day it would not go.. it was also sent with eu adapter and not a uk one (they did send me out a uk one once I pointed this out) I tried calibrating etc and was sent videos from the company once they were open again after xmas that i tried but it still wouldn't work.. He was a very unhappy boy on xmas day as the product didn't work.. Returning wasn't very easy either I was emailed a shipping label finally once they agreed to refund and I'd sent numerous videos showing that the board didn't work!! (I don't think I should of had to do this) I then had to take to post office and await it being returned to get a refund which I had to ring up and chase.. UK company yet returned to Germany. The people I dealt with on phone were from china and therefore there was a slight language barrier and difficulty understanding each other on the numerous phone calls I made..
yesterday i received my package, it looks nice, after charging, i could not help trying it the first time , the speed satisfied me , it really works well. I will recommend it to my friends .