Do you like or hate Derby's?
It is the wrong question for me. Neither way. I consider Derbys OK blades. They are definitely usable daily blades, since they are not very sharp. They do pull when shaving two-day stubble, but no problem for every day shaves.
I use them once in a while. Same with Wilkinson (German), only they are better blades than Derby.
When I first used Derbys, coming from Feather and Gillette, I disliked them a lot but later learned to appreciate them.