Although we initially suspected the Rocket would be quite limited - even for a monosynth - it actually has a huge amount of sound creation potential thanks to its clever oscillator, snappy envelope, awesome filter, and rugged Boost mode.
The sound itself is wonderful even before you get to the filter: the square and saw waves are full and fat sounding, and the adjustable detune and hard sync give you a surprising variety of timbre. The chord modes are welcome too, though being fixed they're naturally more suited to more raved-up sounds of electro and techno, so probably won't appeal to all users.
When the excellent-sounding filter is introduced, and even greater amount of potential is unleashed. Rocket is capable of huge bass sounds, and The Decay time can be made super short for making punchy kicks and intense FX.
The LFO/Arp is a fun addition too, and there's also a Launch button that can either trigger C3 or the last MIDI note received, which is handy for triggering kick sounds or effects, and can be held down to dump patch data to a MIDI sequencer, another cool touch.
The simplistic envelope does limit things somewhat, but the Rocket’s strength is creating punchy lead, bass and FX, so it doesn't really hurt the overall package too much.