I have tryed both MRE's and British ration packs. I find that the MRE's don't taste too bad, but BRIGHT PINK milk shake in a rat pack? Seems like a waste of space to me.
With the british packs, you get much more food for the size and weight of the package, as they are built for 24 hours. I've eaten a lot more Brit rat packs that US ones and find most of it to be edible, just one word of warning for both. Don't look in it when your eating <img src="images/graemlins/wink.gif" alt="" />.

I prefer the MRE individual meals for kits as they are about 1/2 the size.