"Well as the tittle say's.....Should i go with brushless or not ?. This is the question that i hear so much when out and about,What are the advantages of this new technology ?. All i can say tbh is what can i expect to see different compared to the normal impact driver's i see. For one,The runtime. I found myself asking what kind of usage will i get if i attach a 4ah battery. I shall try to answer all of these questions the best i can. Runtime,I can say that i have been running this impact driver for 4 days now on the same initial charge. Being that i am a medium user,used mainly for the installing of 1 inch screws and drilling some pilot holes in to chipboard. After watching some youtube video's i decided to go with this brand/model because of the 3 main features. 1) Brushless Motor, 2) Three stage speed control, 3) Trigger Release Chuck. The speed control does make a difference to the output when screwdriving,having some control over the max speed as well as variable trigger,Delivering the power as and when needed without going over the top. The chuck button,Located just above the trigger is for me a very welcome change to the norm. Being that not only is the head of the driver shorter to get in those awkward spaces,but also for the fact that it is much easier for me to change the bit when needed. not having to hold the driver and release the bit using both hands (As i lack the skill of being able to do this with one hand for some reason) so all in all,In my opinion i know i have made the right choice with this addition to my kit."