Murker blades will always take top place for being the worst blades ever for me. I almost never got into DE shaving because the first blade I used was a Murker. I can't believe anyone would buy them a second time.
The bad thing is that Merkur sells a most of their razors with the Merkur blades in the package. The razors are pretty good, but not the blades.
The Merkur blades are sold as "ice tempered" made in Solingen Germany. I have also tried Van der Hagen "ice tempered" blades which are equally bad. Timor blades are also advertised as "ice tempered", so it may be that Merkur and VDH may just be rebranded Timor blades. In any case, based on my experience with Merkur and VDH, I would never consider the Timor blades.