Credit Suisse X-Links Gold Shares Covered Call ETN offers income-focused investors' exposure to gold with high yields from covered call premiums, but caps upside potential. GLDI's strategy involves selling slightly out-of-the-money call options on GLD, generating monthly dividends, with yields often in the 10-13% range. GLDI underperforms in strong bull markets for gold, as seen in the past year, but can outperform if gold prices stabilize or decline slightly.