Well if it works as intended, I'd say the usefulness rating should at least be a 5/10.
Also, with "only" 750€ in Germany, the phone is pretty cheap with its potent hardware and also being a Razer product, since Razer products usually tend to only be cheap in manufacturing while being totally overpriced.
Love the concept, not sure what battery life would be like powering that hardware though, especially when it's designed to run under load.
Although I'm tempted, I don't think I'd ever use it for what its intended for, only games I play on my phone now are Sonic 1 & 2. Plus I'd never buy anything made by Razer anyway. My Nexus 5 is still rocking after 4 years
Too expensive. I have now a Note 4 from my wife and that is good and enough for me. I dont game and dont do anything more than surf the web, whatsapp and call with my phone.