In reply to TobyA:
> Are you sure its not just psychological?
I've few times tried to place a brand new BD screw and an old self sharpened similar screw. Like just bouldering and placing those two screws side by side. Is it psychological or not but I noticed a big difference. Of course I did it few times in different order so I didn't place that sharpened screw when I was already tired
Or maybe I just don't know how to sharpen screws properly. That's a very possible reason
Or maybe it's just the fact that people will get used to their screws and they won't notice the difference anymore.
Go and get a brand new BD somewhere and compare it to your old ones after sharpening. If I remember right most of your screws were BD's.
Any plans to visit Alps this summer...