I think one of the things going through anyone's mind who's reading this is whether it's worth learning a new instrument since this isn't a toy, or a “let’s push the buttons and make sounds!” kind of controller. It’s a real instrument, with real capabilities. As such, it’s quite easy to find your way around initially and the barrier to entry is low (e.g., you don’t have to build up callouses like a guitar). And the $999 price is certainly reasonable, given the LinnStrument’s custom and precise nature. However, like any instrument, becoming a true virtuoso takes effort.
If you play virtual instruments, then those efforts will be rewarded if the synths themselves are up to the task. For example, some synths that respond to “polyphonic aftertouch” do indeed respond to it, but convert it into something more like channel aftertouch. Very few instruments have release velocity, which the LinnStrument can generate predictably. That said, even today’s “standard” instruments can benefit from the five modes of expression, although you may need to dig into how to assign parameters to controllers.
After playing with the LinnStrument for an extended period, I’m definitely getting better at it. Because I can play guitar and keyboards, those still get the “first call” for a lot of music. However, for solo synth work, the LinnStrument is hands-down better than conventional keyboards. Sure, I can “overdub” expressiveness with those keyboards, but is that really expressiveness compared to real-time playing that reacts to the music? And even if it is—which I doubt—with the LinnStrument, that expressiveness is spontaneous. I suspect that as useful as the LinnStrument is in the studio, its main adoption will be for live performance, and then filter into the studio as people do recordings of their performances.