The build quality is solid, with enough space between the three knobs.
Color coding is used everywhere, and its' fairly intuitive interface let's you figure out many of the modules functions while experimenting. For some though, you need to refer to the manual in order to find them. Step editing the channels is very easy and straight forward, just as using the euclidian mode (once you figured out how to switch between them).
One small quirk perhaps needs mention: when you clock the module externally, make sure to the the internal clock to "0", otherwise it will behave laggy.