Quote from loufah:
The data feed problems I see (I use them mostly for their tick-by-tick charts) is that the data for options is often delayed by some number of seconds (sometimes a few, sometimes 30 or so), and sometimes the data for some options suddenly turns stale and it starts showing a bid/ask that are several hours old.
I sort of compare AMTD to Burger King. You go there because it's cheap and filling, not because of the quality.