It’s only just arrived so I can’t speak for how it will really work. So far so good. Perhaps I should have known that convection ovens are loud, but I didn’t. This one certainly is. I wasn’t sure if this was normal and gave up trying to get an answer from Black and Decker, but an online search confirmed that the noise is most likely normal. 
The oven is good for us as we need the big size and had trouble finding anything that would work. So far so good.