I guess I'm doing the Samplitude Pro X moonwalk a little bit. I asked my retailer to cancel the sale for the time being until I sort out a few things.
I was working with the Samplitude Pro X x64 demo version last night and was disappointed to see that there were issues with level metering on my Mackie Control Protocol (MCP) control surface. I one case, one of the channels' ladder LEDs froze pinned at the max level regardless of playback status. The only way to resolve it was to reboot Samplitude. In another case, a channel that had audio playing back going showed no signal activity on the corresponding control surface channel level ladder LED meter (although active in the GUI) while the other channels playing back audio showed the expected channel level ladder LED meter activity. I was never able to resolve that problem.
In all fairness, I suppose the problem could be shared by both Samplitude and my MCP control surface, but that control surface, when operated with a different DAW software, has its control surface channel level ladder LED meters acting exactly as they should - active when they should be and never pinned to the max without regard to signal activity, that is, behaving just like the DAW GUI channel level meters.
I think I'll use the rest of my trial period before reconsidering my decision about purchasing. If the MCP metering is broken then that will probably be a deal breaker for me. Too bad since the rest of the MCP implementation seems very solid, so far.
Also, I was surprised to find only a single VSTi in the Samplitude Pro X Suite demo (a MAGIX synth whose name escapes me). Maybe I'm just not finding the folder(s) for the other instruments?.