I have the Planet Gemini and a Pro1. I cannot speak for the cosmo, but it seems to be roughly the same hardware.
I strongly regret my purchase of the Gemini, to me I wasted a LOT of money. I have tried to make it my daily driver for 2 months, it was a nightmare.
Starting with the main point of this device, the keyboard. Even if I think it is not meant to, I could not thumb type, the device is too large. So you have to find a table, and even so, it is too wobble. The screen is shaking at each of the key hits. And some keys stay stuck or not press strait. Keys are not purely mechanical