It’s just a really well-designed instrument in almost every aspect.
The oscillators sound nice. It has really nice PWM. It has a nicely round and fat sounding sub-osc. The filters respond really musically with a really pleasing resonance. The noise is slightly filtered. The envelopes are extremely snappy.
It has simple and intuitive controls that are laid-out really well. The parameter ranges and response of the controls feels very musical; it’s like almost every parameter setting hits a “sweet spot”. It’s really simple, but still allows you to choose between various envelope triggering options.
It has good performance controls; there are sliders to set the VCO and VCF depth for the pitch bender individually so you can for example disable pitch bend and use it to control the filter only. You also have a dedicated slider to set the overall LFO modulation amount when you push the mod wheel.
It has a very pleasing sounding portamento with both an “always on” and an “only when notes overlap” setting.
It has a basic arpeggiator built-in. It has a simple step sequencer built in that’s surprisingly simple to operate once you get the hang of it, and that allows you to transpose sequences in real-time.
But mostly, it’s just really really fun.