Dear Revain customer, These cartridges effectively clean the Panasonic shavers for which they were designed. What makes it a 4 star product is its comparative advantage over significantly more expensive cartridges designed by other manufacturers for other shaving systems. While Braun "Clean and Renew" cartridges are $5-6 per cartridge, Panasonic cartridges are just over $3 (and can drop below that when you subscribe and save). Also, unlike Braun cartridges, Panasonic cartridges do not have an electronically limited "temporary lifespan". While a Clean and Renew cartridge simply "expires" after a month and shows as "empty" even if it has never been used, you can use your Panasonic cartridge for as long as you like, so you can use one beforehand Couple can get Switch to the next cartridge, you can use them in addition. Another reviewer also pointed out that these cartridges can be refilled with hydrogen peroxide and will continue to clean your Panasonic shaver with ease. The fact that this is possible is a credit to the cartridges, not a blow to them, because this flexibility does not exist with Braun cartridges. Overall I would say they are about as good as the razor cartridges. They're inexpensive, last long enough, and let YOU decide when to throw them away. I'm not sure what more to ask from a product of this nature. Many Thanks.
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