Honestly, I wouldn’t buy anything from StrongU. They seem to be on par with Ebit, which isn’t great. People are so hyped up about mining right now that they'll grab anything, even the bad stuff. FOMO is real, but don’t let it cloud your judgment with spending on gear. Check out this link I found about their U6 machines.
Nah, U6 is actually a solid X11 asic. It's still one of the best out there. Their Hornbill H8 isn’t bad either. I think the official site is strongu.com.cn.