This is good to hear. I will have to look into the new drivers!
I also wanted to mention for others be sure to check the motor tension adjustment screw. The EFW2 apparently often ships with the screw quite loose and can cause slippage.
In my case the rubber band on the wheel actually came loose at one point. Since I fixed that and snugged down the motor tension screw I have had no further issues with the EFW2.