I'm just getting into modular for the first time and have been fishing around in regards to this topic myself. It's kind of pleasant how little negativity there is towards the variety of modular brands out there, probably because many of them are relatively small operations who genuinely love what they're doing/making. I've made a personal decision to avoid Behringer modules, because I've had pretty mediocre experiences with their products, their reputation where craftsmanship is concerned isn't the highest, and their company seems to be ethically pretty sketchy. Their units are dirt cheap for what you get, but I'd rather get that money into the hands of a smaller more dedicated outfit like Instruo or 4MS or Folktek or whatever, where they're not making a billion of the units and seem to really care about what they make.