I have one on a 243Win which I have shot plenty it at the range, but never had the chance on an animal. Tracks excellent and low light ability on the reticle was a concern.
There is definite tunneling until about 4x, but 4x onwards is excellent.
I had it out hunting this Saturday, in the "piney woods" region of Texas, northeast of Houston. Tight tall timber, unable to stalk on an animal really, and dark.
Official Sunrise was 7:01:03 am and twilight 6:35:01 am
I was able to see enough through the scope before 629am, so that is 32min prior to shooting time, in timber... I wouldn't have been able to use the reticle marks at shooting time, but wouldn't have needed to, as longest shot offered was along a 200yd long logged area.
Clarity-wise by 7am even at 6x I would have been able to use reticle holdovers and windage if needed.

I was on the fence to get another one for the 7mm Rem Mag (which has a Conquest 3-9x40mm) and I ordered it on Sunday. Will play with it at the range and see if I prefer the Zeiss or SS3-9. They are very close to clarity and optical performance to my eyes, and I don't dial muich (yet).