My HR didn't use any oil in the year I had it and had done around 8k miles. Not had any problems with the clicky axle or Bose problems, but I've heard these are still common problems in the HR along with all models of the zed. Can't comment on the gearbox, but it's fine for me
Engine-wise it's not skipped a beat, absolutely love the way it pulls when I put my foot down, especially after it hits 4k RPM all the way to the redline