Amanda good luck tomorrow please post your thoughts about it. Try some shots also with with VC on and off just a suggestion.
Well , I now need a fitness instructor.........I bought it It's not much heavier than my 70-200mm 2.8 with the 1.4 TC attached though.
The VC is noticeably more 'jerky' in operation but I put this down to now having almost a 1,000mm lens equivalent. I tried it in my house and found it didn't track focus on Ai which was worrying, even though it is a latest copy and has a big serial number (should be OK with my 7D). Pointed the lens outdoor into a gloomy wet day and it worked fine. I think it's just not great in really low light. Anyhoo, I now need to find a 95mm filter before I take it out properly.
I tried it in the shop on a monopod and it didn't seem much happier with the VC on. Switching it off improved matters tad, it shouldn't be too much of a problem though as I shoot mainly sports (and stalk the man down the street ). Not read the instructions yet, but I'm guessing it isn't an automatically 'pod' sensing lens?
Big thanks and hugs to all the peeps who had given me advice