The image quality is comparable to that of high-end SLR brand (I could tell, because I also have a D800).
To sum up:
- You have a mobile phone or a compact: go for it without hesitation, you will see the difference.
- Looking for a quality / price ratio: take the entry-level model rather than the other
- You have goals and Nikon accessories and you want a second backup device not expensive: the D3300 is compatible with all recent Nikon lenses and flashes.
Good service from Amazon: delivery and packaging without problems.