I have had a Braun 925 shaver for 4 or 5 years now. I change my head for the second time. This time I let it go for too long (2+ years). I can honestly say I noticed an immediate improvement in my shave. I would recommend changing it every 18 months to 2 years. I think it depends a bit on your beard. I have quite a thick beard, but I also shave my head every time I shave my face. Although I have very little hair there. :) When I first replaced the shaving cartridge, I was upset at the price. But the truth is, it's like buying a new top-end razor for less than $50.
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