I also use TDAmeritrade and the Think or Swim program. It has a level II feature that can show the trades but it doesn't go low enough into sub penny stocks so it's of no use for MXXH.
I do like the charting features so I can find good entry points and exit points. I personally use the MACD graphs.
As far as I can tell, MXXH is a great buy under .003. As soon as they release news on current drilling production, this will move quickly upwards.