I find it quite easy to use and nice to hold too. I didn't use the liveview. My purpose was to try to capture some good shots of these animals. Especially those that require more than 200mm. I reviewed the shots using DPP, the quality is good. Personally i think the clarity and color of the photo still not as good as Canon top end 600mm or 300mm lens and 1D MkII.
This is within my Canon 100mm F/2 lens...

