PiXimperfect (1,62 Mio Subscribers) published today a review of seven Image Upscaler programs on YouTube:
The result unfortunately did not go so well for TopazLabs GigaPixel AI, the relevant passage starts from minute 15:05 in the review.
My trial version has unfortunately expired, so I can’t reproduce the test result and comment on YouTube if this is a bug or problem on the side of the reviewer.
Sorry for the bad news.
Best Regards and a happy holiday season!