I shaved with an Astra SP this morning. First time using one in months. Close, irritation free shave. Sharp and smooth. I need to revisit these more.

May I ask what you used it in? I'm wondering if they will be good in all my razors. I'm thinkin' may be.

This morning it was in a '51 Gillette Tech.

Try hand stropping before that first shave. Can't hurt, might help. Never know 'til you try.

Day 9. A little rough. Still a good shave but I'm going to retire this blade and put a fresh one in the Rocket HD and see what happens with that.