I have been getting around 78% efficiency on mine. After the initial drain, you push the plate down to the top of the grain and sparge. I turn the boil on after the drain to start it ramping up too. I also like the easy of doing a mash out...just set the temp to 168 and recirculate for the time you want.
I've also been getting this efficiency with cold water sparging after seeing the Brulosphy Xbeeriment on it. Not having to heat up sparge water and have the lift up and turn basket makes for a nice, small footprint on brewday.