I have both, I don't think the mileage for oil changes is what you state.
It only hold 1.6 ltrs.
So with a gearbox chewing up the oil, it will go off quick.
It's simple to change, no different to the bullet. I will change mine every 2000 miles. Nice bike, not the torque of the bullet but with a cam conversion, who knows? Might be better than the bullet.