Obviously, the wearing heads will degrade over time yet the unit is still absolutely fine, so upgrading the head effectively gives you a brand new razor for a fraction of the price. Upgrading the whole head is so easy and while replacing the blades only would have been slightly cheaper, this way is marginally more expensive, but it is a completel new head and requires no technical expertise and is guaranteed to fully upgrade the only serviceable parts. - Very happy with the upgrade its like having a new shaver!
