The method holds up pretty well even when confronted with missing data or a lagging connection. The data I receive is accurate most of the time and compares very well with those of others. You can compare some charts that people post EOD and see for yourself. On the rare occasions that I received bad volume data I immediately noticed something was off. A quick look at the 2 minute YM always confirms it, apart from leading indicator it's also an excellent backup in case of bad data.