Yeprs, Roy is the only one to have used (well seen with) the Reactive Armour. I like it way more than the GBP-1S, looks wicked.
Shin and Roy both used the Ghosts in the final battle. Also the leg FP's were made straightaway for the VF-0's first battle.
Ghosts were developed/produced some weeks later. (first seen 4th episode i think) Some Ghosts were launched by themselves also to provide cover for Roy.
Ghosts rule, smaller, lighter versions of the X-9, whilst not as deadly, still would be scary to go up against.