You don't hear about those because they are generally shit.
Low rate of fire, low trigger response. Quirky tiny gearbox compressed into the grip/slide full of proprietary parts, and if you break something you're kinda screwed.
Even TMs. A friend bought the newer TM scorpion and oh boy what a mistake he did.
The gun looks super cool but the performance just isn't there. struggles to lift 0.25s, and sends 0.20s so slow you could outrun them by walking. Range is poor due to the air volume (if you get 20m useable range you're lucky), overall it's an extremely expensive (€280 something) paperweight.
The only good TM scorp I've seen was a HPA'd one. But at that point you're better off with a proper TM GBB pistol (and those are REALLY good).