Like other reviewers, this is one of my all time favorite films and I've upgraded from my original VHS, to DVD, to the digitally enhanced 20th Anniversary version DVD, each version benefiting from improved quality, and now finally (?) to the Blu-ray transfer.
I debated about whether or not to bother to buy on Blu-ray because when produced in the 80's this was a low budget production and to have a Blu-ray transfer seemed like it might be a waste of time if the original recording was not of the highest quality.
I am pleasantly surprised. Obviously the quality is not anything like a new feature film but it is yet another step up from the enhanced DVD. It was interesting to watch again with so much more detail showing in the darker scenes especially. Every scene is sharper and brighter. I would say that if like me, you adore Withnail & I then the Blu-ray transfer is a worthy upgrade from DVD.