Great thread. I own 3 VX5HDs and had a VX6HD with the illuminated TMOA reticle. I sold the VX6HD for a few reasons:
1) the TMOA reticle was not for me. I prefer the thicker firedot duplex in my VX5s for hunting.
2) I was actually not a fan of the zero lock windage. I don't dial for windage and saw it as an unnecessary feature that actually was slightly inconvenient. If sighting in and you make a windage adjustment, you have to always get out the Allen and readjust the turret and lock it down to get it back to zero. Taking off the cap, making an adjustment and screwing cap back on is much easier. I don't dial for windage.
3)The throw lever was nice and I bought the exact same throw levers for my VX5HDs from Optics Planet
4) The aluminum scope caps were nice but not a big deal to me. I actually prefer a scope cover I just take off when I hunt.
5) I couldn't see any difference in the glass between the VX5 or VX6HD
6) I think the eye box is slightly larger and more forgiving on the VX5HD.
So with all this said, I think the VX5HD is as good of a scope for less money.