Sure do, helps see the trends develop and where the biggest blocks are sitting. Also helps to know which outfits are the most reputable, I have heard CINN, BATS, ISEG can move the a stock pretty affectively if they want. The tip was from someone on here, they said if they are pushing a stock down or up it is going to move. I honestly have never seen this in action but I don't follow it that closely and truly it moves so fast sometimes I don't know what I would be looking for. Probably their names at the top of the bid and ask columns trading back and forth? Not sure though.
Big Ben