Yes, TWS really isn't fast enough if you want to know the microstructure of what happened. Sometimes I think about getting an extra data feed that might lag but include all the information however folk like Bolter tell me that even with that data tools like Market Delta don't work well on HSI.
. not necessarly negative, just that can be terriffyin' to trade. u gotta luv those fills tho, in and out in 1 sec buyin' 10ticks below mkt.