Continuum is one of those instruments where you'll probably already have a good idea or what it is and why you want one if you're actually seriously considering one. A bit like if you were considering of getting, say, a professionally built hurdy-gurdy or a full Serge modular panel instead of an electric guitar or a synth keyboard.
If you're more a synthesist and need a lot of synthesis power, a flexible architecture and great sound in an easy to program package, do consider something like Waldorf Iridium. If you want the EaganMatrix modular engine and an expressive way to play it but are more a keyboard player, Expressive E's Osmose has a comparable amount of DSP power as Continuum, wonderful sounds, and a mind-blowing synth style keyboard that responds to even the slightest touch.
If you're eg. a violinist or a trombonist, an experimental composer / sound designer, or a microtonal musician, who feels it'd be bliss to have a super sensitive continuous unquantized playing surface, and a complex synthesis engine that responds in lightning speed, then there's really no other option. I hesitated even trying one for almost a decade - now that I did, I'm wondering why I didn't sell most of my instruments and buy one way earlier.
