The Logitech G-Cloud is similarly top-specced and pricy, although iirc it's supposedly more lightweight and comfortable than its counterparts. It's getting very crowded in that space, I don't envy any of these companies that jumped onto this band wagon and found everybody else doing the same thing at the same time.

I've tried using gamer-clips on my phone and the top-heavy weight distribution makes them uncomfortable despite the lower-mass of phone+controller, so I can see how that would be a design challenge. I still wish Lenovorola had stuck to it harder with the Moto-mods, but I suppose the death of the Atom processor line and Windows Phone means that any such device would have to be Android, and gamers want x86-64 PC-compatible devices, and that's probably not doable in a phone form-factor.