These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Genius Bonus: If you're good at history of the Roman Empire, you'll understand a lot more about RayStorm, including the bosses and the storyline.
Most Annoying Sound: If you're not very good at RayCrisis's Special Mode, the Encroachment Meter will often spike above 90%, resulting in repeated alerts of "Encroachment over 90%!".
Narm: The Japanese version of RayCrisis has one of the bosses named "Sem-Slut," renamed to "Sem-Strut" in the English localization. This wasn't the case with the European PC port.
Polished Port: The PC port of RayStorm and RayCrisis has higher resolution than their arcade counterparts, and better sound effect quality than the PlayStation version (you can hear the sound of R-GRAY 2's laser beams and the ambient machine noise of Yggdrasil). Despite being released for Windows 95/98, both games runs quite well on modern systems and those with higher-end systems can enjoy the almost non-existent loading times. The only downside of the PC version of RayStorm that it lacks the optional TANZ soundtrack of the Extra Mode the console versions have and requires the disc to run the game, and RayCrisis' port is based on the PlayStation version which lacked co-op multiplayer.
Tear Jerker: The ending of RayForce. Our un-named heroine dies when the resulting explosion hit her RVA-818-X-LAY fighter, destroying it along with Earth. The final seconds of the credits pans to what remains of the wrecked fighter, and then we see the dashboard displaying Mission Complete just before the ship's power finally dies.
RayStorm as well. Consider that you just committed genocide of an entire planet in order to stop a rebellion. The 13-ship mode makes it even sadder, as Earth itself got destroyed as well, and the player's ship was left to drift in space, never to be found again.