Firstly if you don't own this on DVD, it's brilliant I owned it on VHS, DVD and now Blu-Ray.....it's a raw and passionate glimpse into U2 at their absolute peak in the late 80's so much so they knew they could go no further and famously reinvented themselves in the early 90's. The version of Sunday bloody Sunday on this release still gives me goose bumps, so if you don't own a version of it or have not seen it buy it now!
HOWEVER if you are already a DVD owner of this release, put your money down and don't make the mistake I made. Firstly to be clear I am a massive fan of Blu-Ray and High Def in general and own the high-end components to do the content justice. The other day I compared Batman Begins on DVD to the Blu-Ray release and the level of detail in comparison was astonishing...the same was true of "The Doors" (Stone -1991) a movie that on Blu-Ray looked transformed especially the desert scenes, the sound on both releases were also notably clearer with better channel separation.
So my point, well out of all the U2 back-catalogue video available, Rattle and Hum is the one which you can do very little in terms of improvement...for starters 80% of it is in black and white (Blu-Ray get most of it's attention by boosting colours), the work done when releasing it from VHS to DVD included much time re-mastering and improving the picture and sound ten-fold leaving very little room for further improvements. The grainy black white scenes are still grainy, the colour scenes look very similar (and by colour remember most of the colour scenes were filmed in very blue/gray conditions)
It's also worth remembering that this was intentionally filmed using casual equipment to help capture that raw spontaneous on the road feel, with almost nothing in the way of the visual effects that we have become accustomed to with this super-group, (No the famous spot-light scene during "Bullet the Blue Sky" doesn't really count). The reason well at the time U2 did not want to detract from the passion of the performances and the music itself....of course a few later years they lightened up and became the most visual band in the world with first Zoo TV then the POP extravaganza.....that's what needs to be released in high def from paramount and hopefully will be, but this Blu-Ray release, well this is bit of a farce.