I haven't but I've heard good things about it. As with most Korean products (like their make up), the Daiichi can seat is said to be really light and easy to use, pretty much fuss-free. It's ergonomical design is supposedly good for baby's developing back. Found a daddy who blogged about the Daiichi car seat:
http://noob-father.blogspot.com/2015/01/daichii-car-seat.html?m=1