I'm with Pharmer, the magic and mathematics that happen inside of a zoom lens is beyond me.
I would be proud to have that lens in my camera bag. I am sure it would allow me to capture a whole range of shots much better than I can with the lenses that I am using now.
It would have been nice at the air show for instance, to capture pics of static displays on the tarmac. My 55-300 wouldn't let me fit the entire plane in the picture when I was that close.
The more I read about it, the more I am starting to get jealous. Almost every review I see for it, the reviewer is in love with that lens.
I think its very cool of Needles to let you test drive it, and I hope you have fun with it.