Quote from SammySOESa:
what he means is, they can always show fake orders, and pull them. they'll place a big block to "show" s/r, then pull it, lower it, or raise it in an effort to reduce or completely eliminate their transparency. but sometimes, it is a legit order. which goes back to playing the odds.
being that it's delayed, and doesn't show the ecn or hidden orders, you have to make your best guesstimate of that's going on. when i see a big order, i'll almost always assume its real, because most likely, other people will assume it's real also, and penny or nickel it.. thereby making it psuedo-s/r not only by the block, but by the ecn orders under it. if they pull it, sweep the ecns with a market buy (including your order), and run it past the spot where their fake block used to be, they got you.. but at least you got your ask price.
it is smoke & mirrors trickery, but with time, you'll learn how to work it favorably.