I received four blades for testing from Andrew of Andrew's Shave Shop: two Personna Gem CS blades and two Pal by Personna CS blades. Both brands are 3-facet blades and carbon steel. I will be testing them this week in Gem Micromatic razors. Monday: The plan was to use the Gem CS blade for the first pass and then change over to the Pal CS for the second pass. That is exactly what I did. I used my Micromatic Open Comb razor for today's shave. The GEM blade worked well on the first pass. It was more audible than the Pal probably because it was encountering thicker beard. I followed up with the Pal on the second pass. It did a great job of finishing off this excellent shave. I got no nicks, cuts or irritation from the blades. After rinsing the blades thoroughly and drying them off, I put them aside for tomorrows shave. I will reverse the order for that shave and use my Micromatic Clog-pruf. Thanks, Andrew, for the opportunity to try these blades out.