The phrase "a testimonial about" is correct and usable in written English.
It can be used when referring to a statement or endorsement that expresses someone's experience or opinion about a product, service, or individual.
Example: "She wrote a heartfelt testimonial about her experience with the coaching program, highlighting its positive impact on her life."
Alternatives: "a review of" or "an endorsement for".
Then he drifted into a testimonial about tomatoes.
But a woman with serious health problems provided us with a testimonial about why changes are needed.
They dragged a community banker up to the stage who gave a testimonial about Kasasa'a ability to generate new saving accounts.
Years later, as a chaired professor of geophysics at the Massachusetts Institute of Technology (MIT) in Cambridge, McNutt declined an invitation to pen a testimonial about Wright in honor of his retirement.
Of course, social proof in thought leadership is more difficult to achieve than it is in your other marketing endeavors; you can't just include a testimonial about your blog on your blog.
Ralph Bakshi wrote a testimonial about the dead crazy asshole that is Thomas Kinkade.
The game, sometimes with almost a testimonial feel about it, meandered on towards the break before Liverpool found themselves ahead after 43 minutes.
If your references will be willing to write a letter or a testimonial talking about your excellent work, you can use it to attract additional clients.
Mr. Bush's assessment was borne out by interviews with Mr. Evans, whose ability to turn a question about the counsel he has given Mr. Bush into a reverent testimonial about the governor's talents is a feat to behold.
He delivered a moving testimonial about that year's winner of the Ig Nobel physics prize: Dr Deepak Chopra, author of the book Quantum Healing.
The first newish song in Beirut's show at Terminal 5 on Wednesday night was "Vagabond," a perky testimonial about finding oneself alone and unmoored, despite what sound like some diligent precautions.
