The blades arrived safely on the 9th as promised. I used one this morning in a Yates 921M and got a very nice, smooth, two-pass shave with no drama. So far so good.I ordered 100 SI blades from wizashave on June 4. They are now on their way in the hands of the US post office. Should be here on Thursday the 9th. Will report back on the quality after they arrive.