Here are my returns for the last 5 years vs. the S&P 500:
Year, Me, S&P 500
2005, +13%, +4.91%
2006, +14%, +15.79%
2007, +22%, +5.49%
2008, -40%, -38.49%
2009, +44%, +23.5%
My portfolio thus had a cumulative five-year return of +35.79% vs. a loss of 2.66% for the S&P500.
I'm especially happy with how constant value rebalancing helped my portfolio bounce back from 2008.
At the end of 2008, I added cash to my account, but still did not have enough to fully rebalance every position. So, I had to implement the triage rule mentioned in my book, and I sold off a few positions to rebalance the others.
My testing had indicated that, after a drop, your portfolio recovers better with fewer, fully rebalanced positions, then having several unbalanced positions.