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Update 20.9.16: Converted this into a regular farm from an XP farm as the combat update pretty much broke the XP farming.

What is this thing?
This is my Enderman farm, courtesy of the majority of the ender pearl supply in my world. Where my base on this world is the 'version 2' of this base on my old world, this Enderman farm is essentially a 'version 2' of this Enderman farm on my old world - except it isn't an XP farm (anymore). The name 'Der Endner' is incorrect German for 'the finisher'.

How does it work?
This design of the farm is very similar compared to my previous farm: When an Enderman spawns, it immediately hits a tripwire which activates a set of pistons. This pushes the Enderman off the spawn pad. Its first fall gets broken by vines before it drops 44 blocks and dies. The spawning room has 464 spawning spaces: 8 rows of 58 spawning spaces, with 29 spawning spaces on each side. This may not sound like much, but due to its efficiency, it's more than enough to reach crazy speeds. The main improvement is that this farm is fitted with an automatic storage system. The ender pearls are picked up immediately by hoppers and then go to the storage area.

Originally this farm was an XP farm, however, I have since converted it into a regular farm as the combat update pretty much broke the XP farming.

The build
I've stuck with the same colors as I used for the old farm, however, everything is a lot more 'spacier' and I spent more time on making everything more user-friendly as well. Everything is also either covered in water or only 2 blocks tall so that Enderman can't teleport out of the farm.