It is likely 7075 as they claim, but it is hardened improperly and it nowhere near T6 grade hardness. So it's cheap, Chinese 7075 aluminum.
I hope so. I wanted the MT410 pretty danged bad til they shrunk it.
The 3s and 4s Arrma stuff is crap in my opinion.
I will one day grab some CVD's for it, but I'm not even sure who makes good ones for it. To be honest, it's sitting under our crawler table with a dislocated axle and I just haven't felt like messing with it. I changed the rear driveshafts on it like 6 times now. Pretty much done with that turd...
Every time we drive it a rear axles gets destroyed. It doesn't like grass. Too much power. It really needs different tires. But we don't even drive it much since we got the Kraton.
The Granite we have is a piece of crap. I regret buying it. If you're going 10th scale, I'd definitely grab the MT10. If going 8th, the Kraton. But AE also makes the MT8. I'd be curious to know how good that one is.