Got my Medusa 80mm 2200kv today, with 4S its just great, it never got over 25C with heatsink and outside temperature ~-5C, running 14/52 gears.
I had Keda motor in it just before, and it had temps 45C with 12t pinion, some difference there, Medusa is solid quality.
I have HotRacing pinions, just keep away from them, if you dont own blowtorch, as those are not hardened. I just stripped that 12t...

Now i have hardened 14t and its durable.