Yes, I am on a reserve list and a I would like to share my experience, strategy and, the most important thing in my humble opinion, my positive attitude towards the process. I honestly think that being in a reserve list is a matter of luck, psychology... and some other things. So, I am at your disposition, ask me whatever you want and you do not find in the internet.
However, I will not comment about the recruitment phase yet. Being on the reserve list is nothing, just a selection of potential candidates until you get effectively recruited (hopefully) as an EU official. I am just living this process, so you surely will understand that I still do not have a good rear view mirror to talk about it.