To begin with, in 1,78:1 you see more of the picture, since the movie was filmed in 16:9 and then cropped to 2,35:1 for the cinematic and DVD releases. I do not know which aspect ratio was intended for being the "true" one, but on this Blu-ray, you see everything you saw on DVD - and more. You'll find a comparison of screenshots on the DVDBeaver-Website, so you can decide which one you like better.
On the other hand, this release has some serious technical drawbacks - a 1080i-picture on a BD-25 is not what I expect from a release of a movie that was shot only about ten years ago. Although the image quality is clearly superior to the DVD, there's much room for further visual improvement. The audio is also not lossless, which may be due to the fact that the movie takes about 18 GB of space on the single-layered disc.
There's nothing to say about the movie itself - in my opinion, it's one of the best crime-comedys of all times. So if you do not own this movie on DVD, you can buy this Blu-ray and enjoy it - or just wait for a re-release with a 1080p-picture.