I've got it, largely because of the piano-like sounds. I didn't get any of their piano instruments previously but I liked the look of this because it looked as though I could do some custom e-piano-like sounds with this one that aren't as glossy as FM but aren't quite real either.
So far, the main positive is that it doesn't suffer from the glassiness you normally get from additive synths, possibly because you get to mess with the phase of the partials and get reasonable control over the envelopes. The flip side of that is that editing sounds is a long-winded process, although that tends to go with the territory of additive synths. The problem with Akoustic right now is you can't paint in slider values. You have to grab each slider before moving it, which is really tedious. Ideally, they'd have an edit switch so you don't accidentally paint settings when you've got a decent profile set up but can set it to paint-it-in mode when you need to.
The big problem is that the support for CC modulation is rudimentary at best. If you want to do anything bowed, you've really only got MIDI mapping to volume to play with. However, that does work well enough to be usable and I have got results I liked just from that. But it's limited. Without some more sophisticated modulation scheme it's going to be stuck making things that sound like they've been hit, to be honest. I think, ideally, you want some modifier layers that amplifie/attenuate partials by a programmed ratio and which responds to breath, modwheel, velocity or whatever. Without more sophisticated modulation, the mutation sounds are pretty limited.
Having release sounds based on the timbre is a nice touch - clearly that's been carried over from their earlier piano instruments.
I think it would also be helpful to have the ring modulation effect done so that it only affects certain partials, otherwise too little is not enough and then it crosses over into too much.
At the current into price, it's a reasonable deal if you like the sound of things being hit that sound vaguely physically modelled and bell-like e-pianos. It's probably not going to get far beyond that without some more control over the sound. If they could do something that lets you draw in filters or transfer functions (and make it possible to adjust how much effect you get from them by MIDI CC or automation), I think it would make the synth a lot more useful. But I can get usable stuff out of it as it stands.