The Kawai synths SX-240 and SX-210 were both released right into the digital revolution and have therefore never gotten appropriate attention (and due to poor marketing). 

The much underrated SX-240 could easily hold up against its main competitors, Korg Polysix and Rolands Juno synths. It came with (very basic) MIDI and a digital editing interface. It also features a dual- and split-mode and can be played in poly-8, poly-4 or monophonic voicing. Its 8 SSM 2044 chips make the filter sound super powerful, with the habit of jumping into self-oscillation once the resonance exceeds the value of 98. 

The SX-240 also has a Chord Memory feature as well as a built-in sequencer. The internal Ni-cad battery tends to leak, risking either the full destruction of the synth’s circuit boards or at least causing a common issue of not being able to retain saved patches to memory.