I am curious too! I'm having a water birth, so I don't know if I'll be able to actually use one, but I think I'd like to see this time.
Dh says its the coolest thing he's ever seen and wants to help catch the baby this time. I think it's WAY different when it's your own baby vs watching someone else give birth.
I'm also laughing at PP who said that you can't un-see it :) Reminds me when a friend recommended I take a look post delivery down there bc it "looked cool." Maybe hers did, but mine looked like a WWII battle zone! ::shudder:: Definitely something I wish I hadn't seen.