It is great for the zoo. You can get by with just one camera. It allows you to take wide angle candids around the zoo of the people and places, and it allows you to take sharp close-up images of the animals. I cannot believe that I survived this long without it. It has all the benefits of a super-zoom bridge camera plus, the detail of an ASP-C sensor. As the days go by, I frequently leave the house with just the camera, and not my bag as it is not necessary to change out lenses.
For you Nikon and Canon owners, they make the same lens for you. It was only $199.00 US, and I can honestly say that I believe it to be as sharp as my Sony 16-50mm f/2.8 and that is a more than three times the cost lens. It is especially good for situations with good light, but I have made some nice photos with it at sunset and lower light conditions.
I can definitely recommend it to anyone interested in an all in one lens. Especially considering the cost.
Here are some more examples:
In the rain
At Photography Meet-ups
At setting sun
Portraits of Pretty Girls
At the Zoo
It performs really well in most all conditions.