It's legitimately the best launcher I've ever used. It breaks the typical mould of pages of icon grids and replaces it with a vertical list of 8 or so of your most used apps.
It makes my workflows so much faster and I can't go back to the typical Android home screen format.
And if you feel that the pricing for the full version is ridiculous, you can try out the KISS launcher that is similar in not using a home screen, but free and FOSS.
Niagara was an easy 5 stars and lifetime purchase, but I now have a seething hatred for apps that stick random words as a prefix; for example, "myCigna" or "Fly Delta" because it ruins alphabetical sorting. I rate them 1 star for their ridiculous naming practices, but I feel like I need to do something more drastic to communicate my anger.