There are many gents out there who love the Euro Gillette blades. They seem to walk a razor thin line between sharp and overly sharp. Feather blades are without question the sharpest blade available but they can be a handful, especially when shaving down close to your skin. The Euro Gillettes cut almost as smoothly but don't peel skin quite as easily.
Sharpness is a trade-off. A super sharp blade will feel great on the first and second pass. They cut so easily that there is very little drag and hence less of a potential for nicks. On the other hand, it takes a very deft touch to finish with these blades. There is a tendency to abrade the skin on the third and fourth passes (if you use that many.)
The Merkur blades may pull a little more early in the shave but they will be much more forgiving at the end. This requires a slight change in technique. You need to reduce razor pressure and possibly slow down. They are very good blades if you understand what they can and can't do.
Unless you are sitting on a large stash of I wouldn't be so quick to unload them. If you like the Euro Gillettes then by all means use them as they are outstanding blades, but sit on those Merkurs and come back to them at some point in the future. I'll bet you appreciate them a little more.
"Two wrongs don't make a right, but three rights make a left."
- Zen philosopher Basha