Platinum installed and updated with no real hiccups. Starting it up, it seems to have successfully migrated my X3 settings. The initial VST scan took a while (long hang on Komplete Kontrol). After the scan was done, I opened a project and looked through the plugin list, checked for Melodyne, etc. Everything seems to be in order. Played back an audio only mix, no problem. Crossing my fingers, I opened a midi only project with a bunch of 3rdParty synths, everything played back fine.
The second time I opened Platinum, the VST scan found 88 more plugins, no idea what they were.
So far, nothing seems amiss.