Has anyone invested using 'The little book that beats the market" and what type of results have you had?

I read Joel Greenblatt's "The Little Book that Beats the Market," and it makes sense to me. Two months ago, I started trying out the philosophy. In that time, I've bought 5 stocks using those stocks identified by www.magicformulainvesting.com, and I have a buy out on a sixth stock. It's really not fair for me to judge the program based on such a short timespan, but I can see how it could do VERY well. The whole point is to create a basket of undervalued stocks and give the market time to appreciate their true value and correct.

Of the stocks I currently hold, one (PCU) has done exceptionally well by gaining nearly 23% in 54 days, another (CHKE) has done lost 19% in the same timeframe, and the remaining 3 have fluctuated anywhere from +5% to -5%.