I have noticed a couple of things which make the Lumin product look a bit low value.

1) The Lumin desktop app taskbar icon is not clearcut, so you see white outside of the rounded corners of the Lumin icon, rather than transparency (e.g. how the Word and Chrome icons appear in my screenshot).

2) On the feedback page (https://feedback.luminpdf.com), 'Integrations' is spelt wrong.

I think you would give a much more professional impression if you resolved these items.