Maija They're definitely not, if appropriate precautions are taken, and enough exercise is allowed
i haven't had any problems yet either, but i wouldn't presume to speak for everyone.
i agree with you that it can be harmful to wear the thighbands permenently without sufficient movement breaks, however, it does not have to be harmful. i do believe medical experts, but medical experts also consider many other things to be harmful, which are mostly not harmful if enjoyed in moderation.