I have the Fusion Power razor, and have been buying the power blades. However, there is s big price difference between the manual and power ones, so I thought that I would take a chance and use the manual ones in my power fusion.
The only difference I have found is that the colour of the lubricating strip is blue instead of orange on the power, and the indicator strip is green not blue. The performance is exactly the same and you can save yourself a few notes in the process by using these instead.
They say that you should get 6 months use out of 8 blades. I have found that you will get a lot more. I use a blade for a full month, replacing it on the 1st of every month. After that, the blades do get a little blunt, but I could probably get a few more weeks out of them, but at the risk of scraping my skin a little. the indicator strip which is a visible sign that the blade needs changing tends to wear off after a few weeks, so I completely ignore this.
Advise anyone who has the excellent Fusion razor to use these blades, you will save money and get the same blades, but not colour co-ordinated to your power razor.