I have one and really like it, it is clear the whole range, however, when you get up into the highest powers it tends to lack light a bit. Mine has tracked well, but for me, resetting the turrets to zero is a pain, I always seem to move POI slightly. Guess it doesn't help that it was below zero when I was sighting it in and testing ammo, fingers don't tend to work too well in those conditions.
I also bought mil dot and am really digging it.
I've had a burris black diamond which is a competitor for the 6500, it was very clear and did great with brightness throughout, however, it didn't track well, or hold POI when adjusting power... I can't have that, so I brought it back to the store.