I actually forget it's even on a lot of the time, and have worn it out while driving and to starbucks etc. It doesn't show at all and doesn't effect walking and what not.
You are however supposed to remove it every 2 hours to give your member a quick massage and break, usually around the 3 hour mark and 6 hour mark you start to feel a little discomfort, but that is when you have to take it off anyway.
So so far so good. The claim is gains after 1 month + the 15 day starting period, so we'll see when the time comes.