I own a Verbos Amplitude & Tone Controller and tried out the Complex Oscillator at a local shop. To me Verbos modules feel very sturdy and high quality. They have a nice robust pulvercoated finish/print, a clear layout with enough space and the potis have enough "weight" to them to feel good, nothing cheap at all here. The big poti caps are still out of plastic, but to me the resistance of the potis when turning is much more important for a good quality feel than anything else.
Sound is much more subjective i think, but to me the Verbos complex oscillator has the warmest sound of any of the complex oscillators, which i like a lot and would prefer it to most other complex oscillators!
Hope that helps!