What do you guys think about buying surplus army rations to take as camping food?

I'm going on a 10 day hike, and I'll need all my own food from the start. I've toyed with bags of oats, rice, and looked at camping food by companies like Mountain House, but it all seems either very expensive for little calories or very heavy and bulky.

So i looked up how they do it in the military, and discovered that you can quite easily buy military rations online. You can get an entire days calories for a reasonable price and a small enough size. Such as these.

http://evaq8.co.uk/Ration-Packs.html

The only reason im asking is because ive never seen or heard of anyone using this method before so it makes me skeptical.