~~~ Does anyone Surf with O'Neill Gooru Vest? ~~~

Holla Surferzzzzz'

I do have some questions for youguys,related toO'Neill Gooru Vest

Here is a youtube video:

My name is Ron, I'm 30 years old, a wave surfer (my experience is about 2year).
During that timeI broke my ribs twice, while I was falling into the water.

I would like to buy myself, the O'Neill Gooru Vest in order to prevent some ribs injuries in the future, also to minimize the risk of broken ribs while I'm falling Into the water.

What can you share with me, according to your own experience with that vest:

1). Is it possible to lying down on the board with that? (is it comfortable?)
2). Can you still dive under waves with it on?
3). Does it give much float and get you to the top quicker?
4). Can I use it over my skin under a loose fit long sleeve surf shirt? (on a very warm weather)
5). Does it actually preventing the damages to your body?
6). If you have any general tips for me, or things I forgot to ask according to using that Gooru Vest

Thank you all

Cheers, Ron