YMMV of course, but they don't get a lot of love around here. I can get one shave out of them at best and that's with a fair amount of irritation and tugging.
I started out with them about 9 months ago in a Gillette and wasn't real impressed and went to Derby and felt like I was doing a lot better.
6 months ago I started using a Merkur Slant and used Derby, Shark, Feather, 7AM, and a few others in it with ok results.
A month ago I went full circle and put a Sharp blade into my Slant to retry them and haven't used anything else since. I get a very nice comfortable shave with little to no irritation or nicks, and have had a couple of BBS shaves with them.
I have a thick wire brush type beard and get 4 to 5 good shaves with them, about the same as the others.
I really like this combo, so I think I'll stick with it for a while.
I am using Sharps right now as part of my 3rd round of testing. During the first round I eliminated them and dropped them from consideration but decided to give them another chance and now they are in my top three along with Astras and Personna red packs. I havent tried anything like Feathers so I am still holding judgment on them.