1 Year 3 Year 5 Year
Net Return 23.27% 24.31% 14.78%
S&P/ASX200 24.22% 25.00% 15.35%
Difference 0.95% 0.69% 0.57%
This shows that the effective "fee" for using this "Index" fund is around 0.57% - 0.95% (it varies as in some years they outperform or underperform the index by a slight amount - aka. "tracking error").
This compares favourably to investing in, say, Vanguard Australia's "High Yield Australian Shares" Index Fund, which invests in the S&P/ASX200 stocks (excluding LPTs) which has a management fee of 0.90% for the first $50,000 invested (0.60% for the next $50,000 and then 0.45% for the balance of your investment in this fund over $100,000).
The buy-sell spread of 0.30% for the Vanguard Fund is slightly higher than you'd pay in brokerage costs for buying a parcel of over $10,000 of CDF stock.
The only substantial difference between these two methods of investing in the ASX200 index that I can spot is that the CDF shares occasionally trade at a small discount to the ASX200 index (XJO), so you could save yourself the buy-sell spread and a couple of year's worth of management fees by timing your purchase carefully: