I can't find anything on that model, but reviews of other ViviCams have suggested that it is a case of "you get what you pay for" -- in particular, the flash probably won't be up to much so the quality of pictures taken indoors in dim lighting conditions is likely to be poor. But for a starter camera for a 6yo taking pictures outside in sunlight (or what passes for it in the UK) you'll probably get your £30 worth.
I've heard Bad Things about the image quality from the ELC camera (and it's much more expensive).