No, no lag, period. That is the common experience everyone has, wondering if having two slaves will feel like typical slaves on other pedals - slight lag, not enough speed or power.
The OFF-set, having such short rods, and really heavy duty joints, plus those stabilizer bars below the shafts creates a VERY stable feel. In my pedal test when I ended up with the Drumnetics, using those 8 different pedals there is no sense of distance between the OS pedal and beater and any other straight ahead pedal. You KNOW you are using a slave, you can see it but, the response is not really any different than any other pedal, other than feeling very solid. To this day the OS remains the most solid feeling pedal I have owned. The 9001 would be right along side it. I never owned one. Mike had it and brought it over one day to try it out next to the Drumnetics. I obviously liked the feel of the Drumnetics better but, the 9001 is a very stout unit. Like the OS it has a pretty big footprint. Nothing that different than other pedals ounce for ounce but, you can feel it. I could. The OS, having the large footprint and pedal board, creates such a solid feel it is not like having two slaves.
When dancing on the pedal and cranking out notes the Drumnetics works best for me but, if the Drumnetics was not available I'd be getting the new E-1 myself. I'd wait for the solid link instead of chain, though. Charles said there has been a problem with something with the manufacturer; a communication mishap or something. He hopes to have the solid link soon, though.