After a lot of research on pot values and other features, I keep coming back to this expression pedal. I use it for my Moog Minitaur (duh), Novation Peak, EQD Transmisser and Strymon guitar pedals. The value adjustment knob and polarity switch are useful and make it a versatile pedal. The pot value is 50K (linear). By the way, for Yamaha keys and the Neo Ventilator, go for a Yamaha FC-7 because the EP-3 doesn't work for those.
Most of the checking-out I did, started with this list here:
Moog EP-3 feels very solid and the pedal stays in the angle you left it in. The included TRS-cable and -plugs work OK.