Be so kind please to tell me what it does?

I generates less heat, so you can essentially fire it for twice as long as a regular Fusion Gun.

Holy shit... Means you hold a vehicle on higher burn-ailment state for much longer?
As damage, afaik, scales the longer you apply the beam, it must do tremendous damage.
Have you tested in on a vehicle allready?

The dream can be real!

It does roughly 2/3rds of a rhinos hp in 1 mag

Chaos is getting something of actual value after the game launch?

Better preemptively nerf that.

Your failbaddon's grace says hello

Not my fault you can't keep your head down target practice.

Edit: On a broader more serious response, i'm not convinced the Autocannon was ever more useful then the heavy bolter, beyond the fact that the autocannon punished high latency players harder with the higher damage output per shot.

Well, but in that case, 1 Meltabomb is more then enough to finish it off, or? Hence the higher cost to balance it?

The point is sustain, you kill a tank with one bomb and kill with one burst, after that you can kill a tank with 2 burst when out of bombs, the AI capabilities skyrocket(corner pre fires and hip fire sprays with a/d spam) and it costs around the same as that extra bomb which is already over priced.

Plus it doesn't promote Jihad as strongly

This could be the weapon the class needed if its a strong as it is, a stronger melta weapon.
The question is why isn't this the fire pike?