Just curious...please contribute your experience with level 3. I found it wasn't very useful and sometime harming my trades.
I use the level 1 , nearest bid offer row for my day trading. In my opinion, the more levels you use, the more unnecessary conflicting trivial things you see, you worse will be your data paralysis problem and worst still, the more money you will lose.
For futures current bid/offer is sufficient and I only use it if the market is at a known S/R or if it is stalling for no apparent reason. I use it more to take profits/lighten a position than as an outright buy/sell "signal." For me, context will determine the import.