Sam Mc,
Sorry, I missed your post. Yes, I'm happy with it. But I have very little practical experience with it. Also, I am new to scopes, so am still figuring out all the features and functions it has (just learned that the parallax adjustment [I think that's what the knob on the left is called] helps with focus at various distances, for example).
I changed the mounting solution recently, so will have to get out and re-zero it. I will report my experience.
As to it's capability at 600y, I have no idea. Sure does have a clear picture, though. Light transmission is good, too (again, based on my limited experience with scopes and magnified optics in general, which includes a 3.4x Elcan, a 3.0x Aimpoint/Magnifier, and a 3.0x Trijicon MRO HD, and some form of ACOG back when I was deployed in 07).
When I asked my buddy what he thought of the scope, he said it was a very good scope. When I first showed it to him, he seemed surprised and impressed. I asked what he would choose instead of it, and he referenced his military experience (mid 80s to late 90s): He said US Optics and Nightforce, since they are a "known quantity" in terms of ruggedness.
As I said before, if you have any specific questions, let me know. I'll ask.
Bakwa,
How precise of a measurement do you need? I don't have a micrometer on hand, but if these things are somewhat standard, I'd be happy to check mine with a tape measure.