I recently purchased this filter from our friends at CONTROL mainly on its strength and simplicity of design, as well as the LED corona glowing around the large cutoff knob (hey, who doesn't like lights?). I had been impressed by this Berlin-based company's other Eurorack product, the Kommander CV/Gate Motion Controller, a handheld dual infrared X-Y motion controller used much like a theremin (though it produces no sound itself). While the 201's bandpass, highpass, and lowpass filter sections seem typical, it's the mix out of those three that I found most intriguing for overdriven effects. The CV inputs are also a plus. I'm looking forward to checking this baby out!