There are quite a few threads on OT about the Leica ER scopes.
They're wonderful scopes. As good as hunting scopes get. To my way of thinking, I believe the 2.5-10X42 version is the perfect all-around big game hunting scope. It has everything I want in a hunting scope, though in a perfect world, I wish they were a few oz lighter.
My only real complaints about the ER scopes are the adjustments turn a little easier with clicks that are a bit too faint than I would prefer on the capped models. The issue here is it's easy to overshoot the adjustments or turn them by accident during initial sight-in. The other issue is the plex reticle is too thin for my tastes, but that's easy to solve by just not getting that reticle. Finally, the power ring selector is a bit stiff to turn, but not unreasonably so.
Optically, they're as good as scopes get. They have "AquaDura" hydrophobic lens coatings, which is a nice feature. The main tube is longer than typical due to the short eyepiece housing, which provides extra ring spacing latitude on long action rifles, always a good thing. They have generous eye relief. They're exceptionally well-made. They're less expensive than comparable scopes from Zeiss or Swarovski. What's not to like?
If you're looking for a traditional hunting style reticle, the plex is the only one that's thin. The #4a and #1 reticles have thick outer bars, so low light visibility isn't a problem with those. I agree that the outer bars could extend a little further toward the center of the reticle on the 4a, but in actual use, I've not felt handicapped at all by the wider spacing, so it's really a minor thing. I have 1 each of the #4a and the #1 reticles in my two ER scopes.
Edited by RifleDude - December/18/2013 at 12:09