I was told by LH staff that there have been a lot of incidents of bogus damage reports being reported with the charges always strangely exactly the 1500 EUR excess. I was also told that LH would be stopping their association with this program, because of the many complaints. Not sure how accurate the information is. In any case, make sure you do not just hand over the car at the FCT, where I believe only a Sixt rep is available. Get an Avis person to actually review and check in the car in your presence.