Tried an Astra blade from the sampler pack I bought on Amazon,.
Prepped my face with a HOT shower, applied some AOS pre shave oil and set about making my uberlather (AOS Lavender cream, L'Occitane soap and glycerin)
3 passes with my Progress and the Astra blade and I was BBS, Rubbed alum on with only slight sting, witch hazel, cold water then AOS Lavender balm made my face feel nice :)
Thoughts:
The astra blades require me to keep the razor set more aggressive then I do with other blades, with my feathers I can get a BBS with it set to a 3 - 4, with the Astra I needed to be at a 6. But I feel the shave is a bit smoother however required more "effort" to do....
Going to try my Derby's next after 3 shaves with the Astra to see how that compares
So far, the review (my inexperienced review anyway) is:
Merkur Blades: OK in a pinch, but not my favorite, 2 shaves max before I need to swap blades
Feather Black (Platinum?) VERY smooth shave, need to dial the aggressiveness of my Progress back a bit but just glides over the face...3 - 4 shaves max
Astra Blade: Needs a bit more aggressiveness but overall does a decent job, doesn't glide as smoothly as the feathers but a comfortable blade nonetheless