Let's look at some numbers with an Asp Explorer engineered to run very cool. Your results will vary. Both FSDs are G5 increased FSD range with mass manager effect.
My Asp Explorer build for getting around the bubble and Guardian / Thargoid sites does 59LY jump range unladen and is designed to run very cool. It has 15% heat in Supercruise and never overheats when fuel scooping. Even down to 20% fuel the class 6 fuel scoop is very fast and the ship never gets over 62% heat. This makes getting around very efficient. If exploring deep space in an Asp Explorer this build is worth considering. Then I added the FSD V1.
Asp Explorer | FSD | FSD Percent | FSD V1 | FSD V1 Percent |
Reboot Time | 10 sec | 0 | 2 sec | +500 |
Mass (no change) | 26 | +30 | 26 | +30 |
Integrity | 94 | -21.8 | 77 | -36.6 |
Power (no change) | 0.69 | +15 | 0.69 | +15 |
Optimised Mass | 1692.6 | +61.2 | 1856.4 | +76.8 |
Thermal Load | NA | NA | 32.4 | +20 |
Unladen Jump Range Full Tank | 58.97 | 0 | 63.66 | +7.37 |
Supercruise Heat (no change) | 15 | 0 | 15 | 0 |
System Jump Heat | 54 | 0 | 60 | +10 |
What does this all mean? We get 5 LY more jump range with a loss of integrity and added heat only when jumping to another system.. A 5 LY improvement in the bubble doesn't mean much unless the jump calculation is perfect thus one less lump at best. It gets very effective when doing 10 or more jumps. Going to Colonial using Neutron stars? The FSD V1 should be considered.
If you are into PvP combat this is probably NOT the FSD you want. Some weapons can delay reboot time and the 2 sec reboot is great for this. Other weapons can take out your FSD and with the low integrity after only one hit. You decide how to use it and there are 14 ships in the game that use a class 5 FSD. I'm thinking about upgrading my three Pythons for cargo, passengers and mining not designed for combat.
The good news: Once it is unlocked at a Human Tech Broker it is added to your stored modules. You don't have to purchase it.
The Bad news: If you want another one you have to unlock it all over again gathering all the materials.
But I am new to this and other players may have better ways to use the FSD V1. I welcome their posts.
Here are my Corolis builds editing the FSD stats for the V1 version.
Asp Explorer
Asp Explorer V1
Add this video that explains it better than me.
Regards