Dynamic Window Approach(dwa) parameter should be false ? true ?

Hi, I'm using nav stack with both of my robot and turtlebot.
I have a question about dwa parameter.
Can I set it false ?
Without DWA, the robot moves fast(it's natural) and smoothly,
and can avoid obstacles correctly.
Also, turtlebot's dwa parameter is false(default) though wiki says nav stack uses dwa algorithm.
[http://www.ros.org/wiki/base_local_planner](http://www.ros.org/wiki/base_local_planner)Don't we need to use DWA algorithm ?
If yes, what kind of algorithm is used as local planner instead of DWA?