I use this lens every day at work.
I am a product photographer at a tech company so I need to get creative with angles to show proper connections and use of products in contextual images. This lens not only allows me to do this but the quality of the images is superb. The detail is incredible, especially close-up details, and when I stack photos taken with this lens I end up with an image that is absolutely true to life and the detail that comes through amazes those I work with and for.
The price can be steep if it isn't a lens you will use enough but if you do you won't be disappointed.
The focusing is very accurate but to set it perfectly, as it is manual, I recommend zooming in closely and using live view as the focus is very sensitive and it is easy to go out of focus quickly.
I also use this at work for employee photos and it makes a beautiful portrait lens.