Here's my story:
Won one in a Rimfire shooting competition so I replaced the NcSTAR on my Savage Mark II in .22LR with the Tasco Varmint 6-24 mildot.
Bought a Remington VTR in .308 and ordered a Bushnell Banner 6-24 mildot for it (ran outta money buying the VTR so I had to pick up a "cheap" scope, paid $120 shipped for a brand new Banner from the EE).
Anyways I took the Tasco Varmint off the .22LR and threw it onto the VTR because I was dying to shoot it. I have yet to be let down by the Varmint after firing about 200 rounds down range with it.
Finally the Bushnell Banner arrived and threw it onto the VTR. 10 shots later it was losing focus after every couple shots, a lemon. Sent it back to Bushnell for warranty repair. I threw the Tasco Varmint back onto the VTR while waiting and was out shooting with it perfectly.
A couple days ago the Brand New Bushnell Banner arrived from Bushnell as Warranty Replacement and Im having a hard time justifying on taking the Varmint off the VTR!
Yes the Varmint has problems with very high magnification 20-24x, it can get really "foggy" looking.
Here's a little tip though with the Varmint on getting the most out of it:
If you turn the bell (AO) up to at least 100 yards and then look at a target that is at least 100 yards away you can easily get up to 20x magnification looking nice and clear. The 24x magnification ALWAYS looks fuzzy.
The problem I find is trying to look at a target at say 50 yards with anything over 16x magnification makes it look "foggy" no matter what the AO is set at.
I had the scope in the back seat when my dad and I were heading out to a lake fishing and we seen a moose 600 yards away on the other side of the lake. Cranked the AO to the max and then set the magnification up 20x and we could see the moose clear as day!