I bought this from Vudu in a recent 3/$15 UHD sale they had, and while the 5.1 surround sound is exactly as amazing as I had hoped, the picture was insanely grainy. The movie poster above works as a good example of the kind of visual noise that was present through the entire film, often times getting so bad it was downright distracting.
As a movie, Days of Thunder still holds up after 30 years, the story is essentially the same one that Top Gun did better, but only just barely.