For the past 3 weeks I have been using a 74 Personna blade in my Gillette Knack razor. Last week my Schick Krona Razor was delivered so I pulled out the vintage Schick Platinum Plus Titanium blades. The Schick was a little rough on its first outing, but since then it has really smoothed out and showing no signs of deteriorating and the same with the 74 Personna. I have had at least 5 shaves with the Schick blade and more than 10 with the 74 Personna and they are both still going strong.