i have 
THIS DeWalt 6 piece set and got the high torque cordless impact with it as well.  It is great, but i wish i had gotten corded tools first.  they are extreamly convienient and great for shorter jobs.  for something like drilling multiple holes through framerails in one sitting, no cordless battery will last.  
there were several times i was using the grinder and drained the battery before the others were finished charging.  consequently, i went out and bought a corded grinder.  i havent used the others enough to have the same issue, but if i project needing to do something like drilling a bunch of holes through a frame rail, i will go buy the corded version.