Most of my repeat buyers write a review along those lines:
“I am a regular buyer of Mark, he always delivers what I need”
“Yet one more success”
And the rarest forms are
“Love your work”
Usually, I have noticed that clients which don’t have great communication and don’t reply too often to messages, are the ones who leave “Thank you” or “Great job”.
I have some buyers, which aren’t super-regular (they order rarely), and they always leave nice long reviews.
However, this is only my observation, it might be different to other sellers, and it might be even dependant on the type of service they are offering, what’s their target market here, and etc.