There's an entire community of ration reviewers on youtube, one of the best is gundog. If you watch enough videos they'll start to reference each other in trades of hard to get rations.

https://www.youtube.com/user/gundog4314

You can also just buy them, they aren't cheap though

http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m5...

I've eaten a few of the U.S. ones. Most of the menus are surprisingly good. The thing that blew my mind the first time was the flameless heater. If you're clever with it you end up with a nice hot meal. Kind of amazing considering they specifically don't want to use any chemical preservatives, but still have long life and thermal range stability.

In the first link they all look surprisingly edible. I think that the french one also includes some brandy which is pretty cool. The caption on the Russian one about the "Cblp" (Сыр, pron. "seer") made me smile :)