For long assembly work while sitting, this is a welcome support. Unlike broader variants, this prop emphasizes by their light weight and the flexible adaptation to the foot position. All Benutzernnen emphasize that it is much more pleasant, here support the feet, as on the broader support, as it does not fall asleep feet :-) The "wobble" that makes the difference. The only complaint: the plastic shelf clacks quickly from locking when a person "over ideal body weight" as a user acts ;-) - but can quickly lock (ie the plastic part) ..... Buy recommendation!