Joe,
As part of a planned maintenace programme, bonnet buffing does an excellent job in between deep cleans. It is quick, quick drying and low cost - most effective on low profile synthetics.
I seldom use it on domestic jobs and would not be comfortable useing it on any cut yarn because of the torque applied to the pile.
I have not yet use the new Charley pads but have heard good reports on the increased efficiency they afford.
Bonnet buffing can also be used after HWE, either just to accelerate drying or to prevent development of various other problems (eg joint-wick on carpet tiles).
John.