I have not really "fully" tested the 70-300 VR....to me, a test of a lens takes about a year...I live with a lens for about year, and shoot it in multiple types of weather....after a year, I know if I want to keep the lens or not, and what it is good for, and what it is less good for. I've shot it against two primes, the 105/2.5 AiS and the 180 2.8 ED-Ai-S, just to see how it compares to those two lenses. I think it acquits itself pretty well for a mid-priced zoom lens, but at the 300mm end, it's lacking a bit compared to a "real" 300mm prime. Focusing speed and sureness is surprisingly good on it. I think I will probably shoot it at the seashore later this summer, to see how it performs there, where there is some strong light. I like the size and weight of it!!