It's a CEF that sells for a 22% discount to NAV, so you're effectively buying Berkshire for $350 a share. And nearly 40% of the entire fund is BRKA or BRKB.

Oh, wait, this is BIF that changed to STEW a few years ago.

I fell for that, too. The story about "getting BRK at a discount". Back when BIF was still BIF.

The discount doesn't matter if it never narrows. STEW (née BIF) has been at a discount between -15% and -22% for the last 5 years. According to the graph at cefconnect, the discount has bobbled around -17% +/- 3% from 2009 to 2024.

Buying BRK at a 20% discount doesn't matter if you also wind up selling it at a 20% discount.
All the while getting clobbered with that high E/R.

IIRC, it is essentially a family held & run fund which they graciously allow the general public to also buy.
According to their web page, the average annual return AND cumulative return has underperformed the S&P500 Total Return Index. Also the market price return has underperformed the NAV return.