In my assessment, Neural Combat Nets are dubious at best.
With two moons, it only takes 3 turns to get full training (training facilities on the planet and both moons will stack). 2 turns for 18% if you need the ships much more quickly.
Also, you can even set up routes to move your ships along to get training. Training occurs if the ship ends up in a sector with a training facility at the end of the turn. You can move your ship to a planet with a training facility and it will recieve training on the next turn. Move it to another planet with a training facility, it recieves more training. By carefully setting up training routes, you can get your ships trained to 20% while they are moving to the front lines with a minimal amount of time wasted sitting at training planets.
Why do you think I eliminated sector training entirely in Adamant and replaced it all with (1% per turn max for non-psychic races) system-wide training facilities?