Aires didn't like them at first, either, which is kinda weird. However, he'd never had treats before (our BO, who had owned him since he was a weanling, doesn't believe in giving a horse anything but hay, and sweet feed if they're old), so he wasn't sure about anything, really. Now, if he even thinks you have an apple, he shoves that big ol' head in your face like "Some?!"
They get the normal horse treats from TSC, carrots, apples, and peppermints. My mare has a tie between peppermint flavored stuff and apples. She doesn't care for carrots. My gelding will eat any of the above with gusto.......but his FAVE' thing is iced oat meal cookies. He does not get these often. They are a very special treat for him.