It's a superb lens, it just makes you want to go out and use it... the lens is sharp wide open (even with the 1.4x tc), though of course the DOF is very shallow so you normally need to stop down a bit to increase this. I find that for bird I often need to shot at around f8-f11 to get the DOF right.
It is a big lens and even with IS it does benefit from good support, buying a decent tripod would be a wise investment and would help you get the most out of the lens. Spend time getting used to the lens, I found that it took me a couple of months to really get the hang of it. I'm getting much better results now than I was six months ago whenI first got it.
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