What do you guys think of the antminer r4? Thinking about buying two from usa (im uk) and running them on kano pool

Is it worth the investment?
I know s9 will have a better watt/th ratio but these will be run at home were i have to pay electric
My other miners i run at work were i dont pay
Also do u guys know any reputable company's that stock the r4 and ship uk?
My biggest problem is the import tax