Another one to look at is 2834, which is the NDX100 tracker.

Same issues around liquidity as 3400, and additionally you might say that you don't even get the diversification of the SP500 as it's a much narrower index. But in its defense, it represents the secretion that has grown the fastest over the last 10 years, and many would argue is well positioned to win out of this crisis as well.

In addition, the dividend yield is very low compared to other indices as they are more likely to do buy-backs than divis, which works well from the HK perspective where capital growth is free but divis attract witholding.

Would love to hear other people's thoughts on this too.