Rating: WORTHY!
I reviewed another book by Kay da Silva back in April, 2016. That one was about sea turtles.
This is a children's introduction to dinosaurs and has photographs of fossils and computer-rendered pictures of dinosaurs in their natural environment. I was able to read this on a smart phone with no problems, although you really want a bigger screen to really see the pictures. You can enlarge the pictures on the phone screen, but frankly, and unlike the claws of Deinonychus, they were not very sharp! This probably won't bother young kids as much as it did me!
The real value of the book is in the details it gives. The author really goes into dinosaurs and their life and habits; not so much that a child would get lost or overwhelmed, but more than you would typically find in a book like this one. The images are not all the typical favorites, either. Yes, Tyrannosaurus puts in an appearance, but we also see Tarbosaurus, Brachiosaurus, Albertaceratops (which looks like it's having a bad horn day), Yangchuanosaurus, Allosaurus, Diplodocus, Elasmosaurus (which wasn't actually a dinosaur!), Kentrosaurus, Peteinosaurus (again, not actually a dinosaur), Plateosaurus, and a host of others, in addition to photographs of footprints, eggs, and skeletons, all supported in the text.
If your kids love dinosaurs (and friends) then this is definitely something you should consider adding to their collection.