Hmm.. Well I did purchase it, given the low price, but initial experiences have been a little underwhelming. In particular I'm having issues with sampled sounds playing randomly late when MIDI events are triggered. Now this is a core-i7 with a Scarlett 6i6 and it works flawlessly in Reaper with latencies down to 3ms, and it works perfectly in Kontakt standalone and many other audio apps, but in Notion, set to use the Scarlett driver, MIDI timing is very erratic. Notes can trigger up to half a second late.
Not impressed, either, that changing latency from the Scarlett control panel causes Notion to completely screw up sample playback (it plays the notes but they are distorted, as if the buffer boundaries are incorrect). Reaper handles this absolutely fine, I can change latency in the Scarlett control panel without any problems. So I seriously doubt this is a driver issue. Set to 44.1KHz 24 bit sample rate. I'll contact Notion support and see what they have to say. Another major irritation is that there seems to be no way to set the metronome volume. This seems like a really odd oversight given that it could easily have been a channel in the mixer view.
EDIT: And a further issue now. Playing back pretty much any of the demo scores crashes it within a few seconds. Since my setup has been absolutely rock-solid with reaper and stand-alone Kontakt, and with a *ton* of different VSTs, I'm dubious this is a driver issue, anyway, I'll take it up with support and see. Tried installing the 32 bit version instead and it was the same. Kinda odd, too, that unlike most software, if you install one version it overwrites the other, as far as I can see. Nor was the 32 bit install smart enough to find the sound library from the 64 bit install without manual intervention. Little things like that make me wonder about software quality. Still, others have apparently had great experiences with it so we'll see what support has to say.