I heard about this recently and decided to give it a try. The profitability charts looked really nice, for example. Anyway, here's my
24-hour review of Hash Cows vs. Litecoin. I'm going to keep it going for another day, but so far things aren't looking all that good compared to other mining options.
Mine for a week and update your review - you can tell from the graph that one or two days isn't going to give you any real information.