When Sai Baba performed a miracle like the one with the grapes, was the experience the same for every person present?

No, Sai Baba's miracles were often uniquely tailored to the individual's inner state and spiritual needs. The story of the grapes in Chapter 35 is a perfect example of this. The miracle of the seeded grapes turning seedless was experienced only by Boss Dharamsee, the skeptic whose doubts Baba wished to quell. After his transformative experience, Dharamsee asked another devotee, Babasaheb Tarkhad, about his grapes. Tarkhad confirmed that the grapes he ate still had seeds. This detail astonished Dharamsee and made him realize that the miracle was a personal communication meant just for him, proving that Baba knew the 'intent of my mind' and acted accordingly for each devotee.