The knife system is generally not bad, but you can not work properly at right angles from the lawn edge. There is always a strip of grass stand when using the side with the guard or the blade is worn out very quickly. In addition, the guard is about 50mm above the blade plane. That is, for example, at Beetplatten which are only 40 mm over the lawn edge, the hanger is of no use. The rest of the unit is good (battery, charger, telescopic handle, ..) will also try to rebuild thread.