I never bought this film on DVD, only having seen it on TV, but bought it on Bluray and have now watched it twice.
First of all the film:- Despite being a gangster film it feels somehow more human than many of them do. I don't know if it's because we know the story of Elliot Ness, and recognise he is going to triumph, or because of the great acting, but it feels more like a Western with its strong moral themes than a gangster film to me. The cast list is great with trademark performances from De Niro, Connery and in particular for me Kevin Costner. I'm not always a fan, but he really got it right here.
Picture Quality is very good. It has strong colours and lots of atmospheric shots. The city has a slightly foggy kind of feel to it and there is a small amount of grain present. Contrasts and shadows are very strong, with the detail still not getting swamped in the night-time shots. For me the whole thing works - it looks like I expect a film to! It is presented in 2.35:1 so it will be letter-boxed on a widescreen TV unless you stretch it.
Audio:- Sound is again very good, with a score by Morricone, which perhaps adds to the Western type feel for me. Sound effects are very clear, and generally very good. A pet hate of mine is muffled dialogue, but by and large it is very good with only a few difficult to get lines. The top offering is a 6:1 DTS track.
There aren't a great deal of extras on the disc, but these aren't important to me, and I didn't do much more than scan through them.
All-in-all the whole package came together very well for me, with no real weaknesses at all, making it a sound 5 stars.