I bought this little synth to add a somewhat eccentric weird lofi sound to my music. I love how much it is easy to use and to achieve interesting sounds. The morph and fm engines are great to create pads and ambient sounds. The attack engine is great for creating that typical 8bit NES games sounds.
On the ergonomics side, the main functions are directly accessible via the knobs (wave types, filter, lfo, envelope attack and release). Unfortunately, some other interesting features must be accessed adding the shift button, like the fx parameters. It can be a bit tricky to play, hold shift and turn knobs at the same time. That's were the arpeggiator and sequencer become handy. Or you might control the device via its midi interface. I don't like this kind of keybed, so being able to control from another keyboard adds much more fun to it. Clock can be synched from midi data, which is a good point too.
The manipulation needed to save a patch or sequence is weird and I can't count the number of times I lost a patch because I couldn't remember the right steps to do it. So read carefully the manual.
In the end, I really like this lofi kind of sound and use it often on my music. It's simple to get a nice sound of it, a unique kind of sound.