I am actually really impressed with Korg these days. They were among the first to push their classics into the VST/Audio Unit/AAX world. They also have pushed their electribes into iOS. Gadget, while kind of pricey is truly a unique take on computer composition and I find myself creating music that sounds entirely different than what I would create in Logic, Reason or Fl Studio.(which to some degree also affect my writing, but I think Gadget is probably the most unique workflow Ive seen).

On the Analog synthesizer front, they are IMO the leader in democratizing analog synths and creating recreations of previously unavailable synthesizers. Arp Odyssey, MS-20 reissue, ms-20 KITS! They are also creating many new and well received analogs or digital analog hybrids with the Minilog, monolog and King Korg. The volca series is also great entry level gear. Im a huge fan of what Korg is doing and I have the Odyssey desktop module. In many ways its better than searching out a nice example of an original Arp. For the most part, they've compared pretty favorably to the originals and have the benefit of USB and midi. I have been able to create a spot on recreation of Herbie Hancock's "chameleon" bassline with it.

Contrast this with Roland. They have also recently been trying to recreate their past(again) but digitally(only). From an outsiders perspective it looks like they have lost their analog expertise to attrition or retirement, as they have only released two analog synthesizers in recent times in the SE-01 boutique module and the JDxi hybrid synth. The rest of their repro gear is digitally modelled. I dont think there is anything wrong with that, and I do own some of it (TR-8 and JP-08) but my take is that they are riding on past success more than pushing the technology forward.

As for this app, it certainly isnt anything I would use or want, but I think its great they are pushing rhythm and music to a large audience. No reason to hate on them for that...