I only have 1 experience to an Airdrop and it is not a very good experience. It is NXT - IGNIS.
We sacrificed not to sell it before the wallet's maintenance just to be present at their snapshot. Then of course after the maintenance NXT dump really hard. We had a difficulty to sell it due to massive dumping. It was last December 2017, until now IGNIS is not yet distributed to different trading platforms. We all just accept the fact that we are fooled by THESE 2 COINS.