Trudy, I was reading the feedback on this person and it's pretty generic feedback, mainly thank you or fast shipping and the negative is mainly about shipping also . Most people leave feedback as soon as they receive their package and if the said tuber didn't actually grow then the seller couldn't go back and leave a different feedback.
By the way, this is the same person that was saying they can grow these over on the Garden Web forum. I searched "daylily tuber" on eBay and this person is the only one selling "tubers". There is a couple of the auctions where there is a photo of these tubers and they are the roots.