The application looks and feels nice, but the per-device pricing/licensing model seems severely outdated to me. I will not make a purchase unless named licenses, which enable me to use the application on all devices and operating systems I use (with reasonable limits if DRM is needed for some reason), are available.
Also, TablePlus seems to be selling well (at least from what I see around me), so I am not personally of the opinion that they should change their model!