I do use the sync feature (probably 95%+ of my sales are
ebay but I sell a handful of things on hipstamp a month). It seems to work pretty well going from
ebay to HipStamp. It used to be that if something sold on hipstamp, it would automatically get closed on
ebay. That is no longer the case. I close them manually but I think hipstamp has created a utility to help with that.
I have not seen any issues with the "was" or any other discounting but I honestly don't pay much attention to the hipstamp store, which is just an inexpensive way to mirror my
ebay store at low maintenance.
I sell postal history for the most part, and the buyers are at
ebay.