I have the latest MGI Quad Gyro remote control buggy and it is horrible. They have upgraded the battery but unfortunately the speed control software cannot cope. Each press of the remote delivers an overly sensitive change in speed. I now have a buggy that is either going too quickly or too slowly when walking with it. MGI reckons there's no problem, even though they admit there is an "issue". So which company offers a better alternative....and better after-sales service?