I've purchased this microphone to be able to measure the response of my monitors in order to apply digital room correction. Every other bit of my gear is from Thomann, so it was the natural place to come and purchase this!
You will find mentions online of many other measurement microphones, including the likes of UMIK-1. If you are going to use more specialised software (Acourate, Audiolense, ARC 3 etc.) it is not recommended to use USB microphones, but those that require phantom power and connect straight to your interface.
The microphone came extremely well packaged, in a relatively small box, encased in foam, with a microphone stand holder, but please note it does not have the thread adapter. You're also getting a hand-filled report of the microphone QC test results as well as a card with instructions on how to get its calibration file. On that note, Earthworks were pretty fast with providing one, but do note it's not an automated process, so some form of delay will happen.
There is not much else to mention... You're paying for what is essentially a ruler-flat measurement microphone, built like a tank, that will most likely last a lifetime. It's that simple. :)