Firstly, you should know that neither the gen insert or the aftermarket insert will fit the UPO without modifications. According to The Zigmeister, the back of the insert needs to be ground down and it needs to be pressed in place with a crystal press. As for the insert you found on ebay, I do not see any real improvement over the UPO insert. The pearl is positioned incorrectly, and because of the poor images its hard to tell what the pear quality is. Also, on the orange version the fine orange line that surrounds the triangle is missing.
Id stick with what you've got.