I got one along with the 7D2, since it was only $300 or so more to get the two lens bundle. I only have a few shots on Flickr that used it ( https://www.flickr.com/photos/15493374@N03/tags/2470mm/ ). All the shots are either outdoor or w/ flash. I don't tend to use it, as when I'm outdoors, I'm shooting dogs or wildlife at telephoto distances, and when indoors F/4 doesn't cut it without flash, so I use a prime, usually the Sigma 35mm Art.

If you just want overall 'how do you like the lens', then, as I said, it doesn't work for me. Portrait shooters, landscape shooters, heavy flash users, they all might find uses for the lens.

If you know anybody picking up a body, see if they can get the lens bundled dirt cheap. I know my price was a Canadian 7D2 launch promo deal, but I'm sure Canon offers deals like that all the time.