BNI is probably a great long term investment but I do not have the long term horizon Berkshire has, lol. I think that traders that jump on the BNI bandwagon now will not have the patience to cash in years from now; I don't think BNI is a good trade.
GBX might be a small cap way to play options on the beaten down railroad sector, it is near its 52 week low and might get pulled up by the Buffet fever.