There have been numerous studies done on compression garments and sports performance. This is NOT new technology; this is NOT unique to the product posted here.
To research this fully, go to google and look for sports performance compression garment study.
Just last week I wrote about this in another topic here, related to shaving and sport performance.
In a sentence, compression garments can improve your performance via muscle flattening (lowers vibrations, helps prevents injury, and keeps bundles together) and giving something to push against (widely used in strength sports). This was well documented years ago. Additionally, in some sports, like Olympic Swimming, let's say, garments streamline the body (E.g., shark-like garments).
Any pair of tights will do, however, and it's not unique to a particular brand, of course.
Research this further, yourself, for the science and the details. Based upon that science, you should be able to make a more fully-informed decision.