I have been looking into using one of the virtual cash services such as Bitcoin or Kurrenci and wondered if anyone else is using them.

Are they 100% safe to use?
Is it easy to get cash transferred into your bank account?
Can they easily be added into Zen cart?
I have read conflicting reports about the commission charged, anything from 0 to 10%, so what is the true cost?
There is a Kurrenci add-on module so would that be a better option than Bitcoin?

All comments good and bad will be appreciated