This is something I also really like to know . Lately someone has allot of choice between different kind of extenders and ads .
With the ads you could wear it all day , attached to your leg or to the side and no one would even notice , the only cons with this is that the pressure is not even , when you walk the pressure would increase while when your are sitting/sleeping it’s even . Also it’s much much cheaper and in my opinion ( after spending on 3 extenders) it’s more effective and more comfortable .
With the extenders , it’s more bulky , you have to take each hour a break . The only pro with the extenders is the fact you could take progress of your force and you can increase the length with the bars while with the ads you can do it manually .