<prompt> Human: Berkshire Hathaway stock BRK-B has outperformed the SP 500 over the last 1 year, 2 years, 5 years, 10 years, and since inception almost 20 years. It is also slightly outperforming in 2015. Ive read that index funds are the way to go, but its hard to argue with this data. I mean the stock has outperformed on virtually any measure you look at. I feel like I am leaving money on the table by investing in a low cost SP ETF versus putting some of my cash in Berkshire and letting it ride with Buffet. Even a 1 higher return can result in a lot more cash due to compounding and time.I guess Buffet retiring is the main risk, but Id have to assume that hes hired a team of managers that adhere to his investment philosophies? Thoughts?Edit: I didnt mean to say Id put all my savings in Berkshire, I was just considering putting a sizable chunk. Revised the text accordingly. Thanks all for the feedback.  <response>: First of all, this may be nit-picking but BRK-B underperformed by about one percent over the past 5 years. For the other time periods you are correct.I found an interesting analysis of Buffets performance here It appears that Buffet did indeed achieve a better Sharpe ratio than the market as a whole. He got both higher returns and higher volatility, but the improvement in return was enough to more than compensate for the increased vol.In general, many investors may be uncomfortable with Buffets higher volatility: Note this quote: from June 30, 1998 to February 29, 2000, Berkshire lost 44 of its market value while the overall stock market gained 32. What if something like that happened when you were a few years away from retirement? I dont think Im okay with that level of volatility. 