I recommend it to anyone who’s interested in polyphonic analog synths. It has its limitations, but I’ve had mine for years and haven’t felt the need for get another (conventional) synth.
For anyone who wants to learn more, Loopop has a great review of it: https://youtu.be/So8B6HJ2chQ
I think most people who remember Blade Runner's lush soundscapes would get fooled by a good DM12 patch. Obviously there are some more subtle modulations that would be hard to replicate (and the DCOs vs CS-80 VCOs certainly don't sound as retro), but I think it's "good enough" to satiate most people looking for a complex pad synth. There's always the 99% of a CS-80 synths out there like Deckard's Dream, too.
After that, it's mostly up to you. There are hundreds of niches in both sound design and music theory, all of them with their own unique quirks to learn. Let your sense of curiosity guide you, and you'll definitely find something interesting. You should probably look into getting some DAW software if you want to compose full tracks, and a DAC would allow you to record off the Prologue into your computer. It really is an open-ended hobby besides that.
The only other piece of advice I like to give is to temper your expectations. The process of learning music theory and sound design is long, and everyone makes a lot of garbage when they're starting (much like programming). Unlike programming, I find the process of sound design to be pretty therapeutic, and many nights I'd find myself sitting in front of my modular rack instead of watching TV or playing games with friends. Everyone's relationship with it will be a little different, but nobody should be overly critical of their own work. Do whatever is fun to you, and let the inspiration follow.