I've been using PSP Ultimate 2021 and I just upgraded my ON1 to 2021. ON1 now creates a plugin to PSP and I can open up photos in PSP and use the plugin module to use the full editing capabilities in ON1. It's pretty convenient. I really like it.
ON1 is a nice program. I've been nudging myself away from Lightroom and acclimating myself to ON1's methodology. I joined their ON1 Plus Pro program a while ago and like the great variety of training videos available free to download and keep.
Happy shooting
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