I have 5K of 5.56mm LC brass that I consider GOLD-its the best brass out there! Anything made by Lake City is top notch. There 7.62mm brass is excellent as well, many reloaders would buy assembled LC rounds-pull the bullets and insert Sierra MK and call it Mexican Match. Shoot it yourself or sell it, there will be a demand for it, its in the same class as Lapua and Norma as far as I am concerned.
As noted, you have to drop your powder charges a bit when reloading it as the brass is thicker than commercial stuff. But the brass lasts for a long time and is great stuff.
If I had to choose any brass in the world to work with, Lake City would be my first choice, however its hard to find up here! Cherish it or sell it for good money!