Had to change after 7 months because the quality of the cut became terrible. Unfortunately, replacement blades can only be obtained via Amazon or (sorry DGM) or from the competition at https://www.brack.ch, where you can order the replacement shaving head. However, for 42.- plus shipping (instead of 30.- including shipping).
I've only had mine for 4 months but it still cuts like it did at the beginning (I cut 1-2 times a week). Replacement blade is only available on Amazon at the moment, I saw, incl. shipping 30.- €.