I have really thoroughly been enjoying harvest. It's learning curve is like 0 to 60 and no time flat. Although I look forward to Future updates with maybe options to select and drag whole groups of notes or maybe you can do that and I just haven't figured it out. Either way I've been having a blast using it on ultimately leads and bass lines. Also it's great for re mixing MIDI files.
I must admit I have overseen this but I would assume it is more or less meant "only tested with" cause it (free lite version) worked for me in Mulab for example. But I got shocked I must admit as I have read your review, and yes, at last it is misleading especially as with Live/Max for live so many great things in this area (generative/sequencer) really only work with M4L. They should make this clear. Maybe write to support, they are responding quick and are very communicative and nice.
Ah well I think I spoke too soon about Sonar. I had what seemed to be a successful session with Harvest in Sonar. When I opened the project again to do additional work, the project through an exception every time. I started a new project again with Harvest. It seemed good and I saved it. On restarting and reloading, the same crashes occurred.
I am happy to report with Studio One, I did not have this problem. I started a previous song file (i.e. project in Studio One) and it started up cleanly. I will use Harvest in Studio One which is satisfactory for me. Anyway, Harvest does not claim compatibility with Sonar in its spec ... I guess its just a different animal.