I'm Simon Haynes, and I've been using Indesign CS5.5 and Photoshop Elements 9.0 for some years now. Before that I was a keen Corel Draw user, going all the way back to Corel 2.0 on Windows 3.11.
I bought Affinity Publisher/Design/Photo last week, after trying the trial version for about 30 seconds. It's great so far, although there are a few tiny annoyances - mostly to do with importing and exporting. I don't think this is the place for suggestions or bug reports, but every other time I go to import a file it defaults to showing text files only.
The irritant is that it doesn't remember the last-used import or export folder per document. This is a huge time saver in Indesign, and is sorely missed in Affinity Publisher.