Best air shock I've ridden in terms of sensitivity and plushness, but have had to play around with the volume to get the progression I want, as it is not as progressive as most coil shocks.
Well I don't know about instructions, but as the vivid can only be opened by a special tool, I recommend you to go to your local shop where they service shocks and ask them if it can be done. It's very easy, but only if you know how to do it. If you aren't sure about it, I wouldn't advice you playing around that!