"low tax efficiency (because of taxable capital gains distributions resulting from portfolio turnover) and high (1.8 percent) annual expenses"
See the following two links:
Behind the Oceanstone Fund’s long run as a Lipper Leader
http://www.fundmojo.com/mutualfund/fund_report/mutualfund/OSFDX
But the fund seems pretty stable. I am really amazed about this guy's experience.
