I enjoy using metal restraints because they're not something everyone has or uses. In My Dungeon, the furniture collection includes steel standing stocks and a metal bondage chair with arm, leg and neck restraints. We also have a ball and chain, and two scavenger's daughters that I bought from Simone Kross. If you aren't familiar with the latter look it up, it's a fun medieval torture device just like the others. I would say that the downside is they aren't great for all body types, don't expect to get someone to be in there for very long or someone who isn't very flexible. There's also a time limit before things get too uncomfortable to stand to be in. Looks great in videos and if extreme is what you're going for thats what you're got.