Deep Cover is something of an undiscovered gem amongst 90s thrillers (I.e. Most people have never heard of it, but it's actually rather good)
I seem to recall it got reasonably good reviews on it's release, but suspect it didn't do that well at the box office, due to the lack of an A List cast (though Jeff Goldblum was more of a star then, than he is now)
This is a cool, slick thriller, but it doesn't glamourise drugs, or violence. In fact some scenes are very intense/graphic, which is perhaps why this film doesn't get more showings on TV.
In some ways, it's the film Miami Vice should have been (moody, intense and cool)
Admittedly, it has aged slightly (some of the clothes and hair styles look a bit dated) but overall it still works well.
The picture quality is OK/pretty good, considering the age of the film (there's slight grain in just a few scenes and also occasionally the black levels aren't quite right. Otherwise it's fine, in fact some of the close ups look incredibly sharp & detailed)
The soundtrack is only a stereo mix, but it's a pretty good stereo mix, with lots of left/right detail and the Rap style music still works surprisingly well.
In summary, a good/very good film, with goodish picture & sound. Well worth buying if under £8.