I picked up my Haibike for an absolute steal and he chucked in the badass dongle with it too. I managed to get it working after about an hour fiddling about with magnet position. However, the thing cuts in and out all the time or goes totally mental. the bike is not enjoyable to ride either with the badass on due to the unpredictability. I ride fairly hard over the mixed off-road terrain. has anyone actually managed to get a badass working smoothly or shall I just give up and get a Speedbox2? and yes it has a fresh battery in it!