This synth is simply fantastic. Built to pro standards with the best keybed I've played in ages. Lots of realtime control (though a few omissions like direct control over PWM destination, portamento time, etc.).
The sound is outstanding. The analog emulations are very good - maybe not quite as good as the System-8 versions but the tradeoff for polyphony and sound engines the System-8 can't do is worth it.
You get Jupiter-8, Juno-106, SH-101 (with polyphonic mode), JX-8P, RD-series, plus the entire XV-5080 engine and tons of great analog and digital drum kits to boot with 4 synth parts and 1 rhythm part.
It's not a workstation so you need to sequence externally, but that's not what it was intended to be. I am sure Roland will release even more model expansions in the future so this instrument will only become even more powerful.
If you like the Roland sound, this is your desert-island synth.