Direct Reflect (DR)

We are using a Trimble S6.  I'm wondering if anyone is using the Direct Reflect capability and what accuracies have you achieved with it.  I personally have had bad luck and significant errors using the DR funtion to locate building corners.  What about using it to locate a flat surface such as a concrete wall?  Can you get 0.01' accuracies?
Please let me know your thoughts on this subject.

It's been a while since I've used an S6. 

IIRC the S6 has a rather large reflectorless beam and may return bad readings if a significant portion of the beam is hitting something behind or in front of the object you're shooting at or when you're shooting at a significant angle to the feature.

Which S6 do you own? I have cited two below.
 
Notice the way the specifications are written. Yes, there is a (2mm...) and a (+/- 3mm...).  The 2mm should probably be written as +/-2mm…
 
Make sure you read and understand the datasheet for your equipment.
 
 
http://trl.trimble.com/docushare/dsweb/Get/Document-208580/022543-098J_TrimbleS6_DS_0110_sec.pdf
TRIMBLE S6 DR PLuS™
DR mode               Standard               2 mm + 2 ppm (0.0065 ft + 2 ppm)
 
http://www.pacificsurvey.com/pdf/S6.pdf
TRIMBLE S6 DR300+
DR mode               Standard measurement     ±(3 mm + 2 ppm) ±(0.01 ft + 2 ppm) 

Your accuracy/precision will also vary depending on the following items:
Target color,
Target surface texture,
Angle of inclination of your Total Station,
Angle of incidence to your target surface,
Distance to target.