I ordered mine back on December the 9th and finally received it about 6 weeks later here in the US. At this point I’ve only been able to use it for less than two weeks. I read about people using it for several hours daily so I figured a good first try was about two hours, big mistake. I was sore to the point of not being able to wear it again for about 3 days but not to the point of serious injury, and that was just wearing it for only two hours.
The next time I wore it I only applied the unit for one hour and was fine to wear it again the next day. After about a week I was able to add two of the smallest extension spacers to each side with the same comfort level but still only wearing an hour at the most.
I will say that it is designed and constructed remarkably well. When wearing the device it feels as though it’s not doing anything at all and offers no discomfort whatsoever, however the next day you certainly notice that some stretching has taken place. Similar to going to the gym and hitting legs real hard and getting DOMS the day after. I felt like adding the third and last smallest spacer to each side today but think I’ll wait a few more days just to be on the safe side.
The device is definitely unnoticeable under loose clothing and wearable while doing light work.