The Astra blades I like that, the rest well ... I did not like personally much.
A significantly duller and rough impression make the Derby's
Dorco and Shark Super Chrome I once tested. If both not for me, shaving was anything but pleasant.
That the Shark Super Chrome starts to rust, there is already another user has noted.
The Shark Stainless I have not yet tested and to be honest, after the Super Chrome Irritating am not particularly the Stainless.