Feather Hi Stainless Platinum Razor Blades
Derby double edged DE blades are an excellent all round razor blade. These blades work very well in Merkur razors and are a little more forgiving than the Feather blades and more similar to Merkurs own blade.
I find this the best blade for my skin. It lasts long too! The shipping was fast.
This was my first blade and it lasts two weeks giving smooth shaves.
I've tried out a few different blades that come with the sample packs. Derby was noticeably the sharpest and also lasted pretty well, I get two to three shaves per blade. I've read on various forums that different people are suited to different blades, and with that in mind I can't say that derby will be the best blade for you however I would recommend you give it a try if you haven't yet.
I started with these (came with the EJ razor) and tried some from my sampler pack later. Every time the shave was an effective, easy one - sufficient cut, gentle enough touch. I used a DE89BA11 and cream lather. These definitely worked for me (and my razor), but I've found other blades to provide an even sharper and faster shave.
These Derby blades are brilliant blades for my Merkur Progress razor.