Few people make use of it. I have to look for it each time but with something like eggs I use it when I have a hatch. Most people leave feedback when the eggs arrive in good shape and in a timely manner. There is a little widget where you can add to the feedback later on when the eggs start hatching. I don't bother if I have no hatch. I understand too much can happen en route because of handling but if they hatch it's nice to let others know. Example of real feedback from a very successful duck hatch: Positive feedback rating eggs arrived quickly with none broken Buyer: fostesky ( 1663 [Feedback score is 1,000 to 4,999] ) May-07-08 11:32 * Follow-up by fostesky (Jun-04-08 04:36): I've got a mallard colored runner and black one and I see pips!!!!! Ducks!!!!! 5 Indian Runner Duck Hatching Eggs Holderreads Stock (#180236390293) US $5.99 View Item Just copied and pasted from her feedback. You can see when I got the eggs and you can see when I started hatching. It's a very long way from Kansas to New Hampshire but I won't hesitate to buy from this person again. The eggs I got at the same time didn't hatch nearly as well and came from neighboring Massachusetts. Nothing the seller did wrong and some did hatch. I did leave a positive followup on that one too. It's nice to know if somebody else had luck. If you look at a persons feedback, at the bottom of the page there is a link to post a follow up to feedback left. It's a nifty little widget ebay provides that is underused.