I've read a few references to these being good for post partum care, and I've never seen one nor used one.

What is it used for/HOW is it used?
Is it necessary (esp in the case of hemorrhoids)?
Should I buy this now or will my hospital provide?
Will I really use it or should I just use Tucks pads?

I'm getting all my post-partum supplies ready and would rather be safe than sorry, but I also don't want to spend $11 on something I'll never use.