To be honest,.. I'd actually prefer one of these controllers to many of the digi ones currently available, especially at the price.
The tech is simple, its just a PWM speed controller in a waterproof box,.. no messing with calibration settings, no battery saving cut out -- it controls pump speed in the most simple way & can't really go wrong. If it does go wrong, every single component is readily available off ebay so its easy to fix.
It does look a bit DIY though,....