One problem with Level 2 is the ability to post fake bids /offers or the ability to hide your size with reserve orders Robert
The specialists post fake bids and offers quite often. An offer is there,you go to take it and you get bid there without any stock trading there. A bid is there and you go to hit it,and you get offered there.As far as hiding size goes, do you think the specialist shows his hand,let alone the floor brokers?
With the advent of NX, listed stocks can be great for scalping (up to 1000 shares). Look for volume in a stock that moves 2 - 3 points a day.