I've owned BRK for just over 2 decades. Yes, it's been a fine performer. Sure, it hasn't shot the lights out - but neither did MSFT from 2000 to 2010. You had to time it just right to benefit from the massive tech run - who knew? Not my game. BRK is like an equity-bond that yields 10%, with very little risk. Additionally, you get an upside kicker, when the market goes to hell in a hand basket, you lose less, and stand to make much more as they deploy capital during the storm(s). I sleep well owning BRK. I don't think every S&P 500 ETF holder can say the same.
Certified fan-boy.