Lol, I are newb, and didn't know what they were until I read the thread.
But imo, I think that handbras are AMAZING when done really teasingly, but they can get boring when it's ALL they do. Because, like someone said earlier, they're very limiting.
Quick question though, if a girl is not directly facing you, and it's like her forearm covering her nips, is it still a handbra? Or is it a forearmbra? ... Or there's just no word for that, lol.