I have used the EZ-IO only in training and demo, not on a patient yet. That being said, this seems to be a pretty slick little device. It is fast! There is a lot less force to get it in place as compared to traditional, manual IO needles like the cook or jamsheeti (spelling?). My system is in preliminary discussions as to adding them. I am excited about the device. Not sure how often we would use it, but a nice tool to have anyway.
Hope this helps.