Well I have always hated the Elcan in any version. We never found any based from GenI to the current GenV C79A2 version to hold a zero.
I jumped one and came off it with a base only (the opitc was AWOL) - this was the time I decided a BIS was a good idea

-and no one would move forward of me and my buusted sight when the it went live (Go figure trust is so low

)
Do to the external adjustment system all impacts are transfered immediately upon the elveation dial and the windage screw -- these two points are the features that hold it to the mount...
I'd love to saw the new ones are any better -- but I can't.
I veiw this optic as a 6 month life span -- maybe a lot longer if your in a leg unit that does not shoot.
I fail to understand why they cant adopt an internal adjustment system - like the ACOG. It would add a great deal of impact resistance.
IMHO have played with both -- I went out and spent my own $ on the S&B Short Dot - which I bought before I became a dirty contractor rolling in money.
A buddy of mine pointed out there is a reason why NONE of his six uppers he is issued has any ELCAN product on them... (EOTech's, Aimpoint, ACOG's,Nightforce and S&B)
most any user that has experience with them comes back and says -- great optic -- to bad its wrapped in a crap mount.