I just received the CS-57 'Alien' helmet from Sunrimoon. It's really good quality. The outer shell seems durable, the gel pads inside are comfortable (even comes with replacement foam pads) and the magnetic buckle is really convenient, you can take it on and off with one hand. The adjustment dial is smooth and can be moved down for a better fit. I opted for size M having a 58cm head and it fits me, but I'd go for size L if I had a bigger head. Also, really light at 240g.
The main drawback for me is the branding, which I find a bit loud. Probably wouldn't complain if it was a name brand to be honest. Also, the paint finish around the edges of the shell could be a little cleaner, and my glasses don't fit particularly well in the slots.
Overall, a great helmet! Well worth the $80.