The ward placed cannot be targeted by allies, so it cannot be used as a Teleport target or for the purposes of 'ward jumping' such as with Lee Sin'sSafeguard.
The ward placed has a lower (500) vision range than other wards (1100) and only 1 hitpoint.
The ward grants 15 when destroyed.
Using the Farsight Alteration is visible to the other team through the Fog of War (if they happen to have the camera near the area) but not on their minimap.
The ward placed by the Farsight Alteration does not count towards your maximum ward limit and similar to a vision ward has no limit for how long it can last, so using this could theoretically allow you to place infinite wards on the map.