P. Stever (3/29/15)
This cube is not one of the best, but it is good. I average 19-20 seconds and this cube performs great for me. I prefer this over my zhanchi, shuangren, and gans, to name a few. I wouldn't consider it "fast", it is a very controllable speed. Definitely not slow. I do get corner twists once in a while which can be annoying, but it is not enough to make me not want to use it. Popping never happens.
W. Belote (3/28/15)
This cube has a very interesting feel that I really like: crunchy, but at the same time kind of smooth. Performance is solid, but nothing special. At my speed (~30s), it's definitely not a limiting factor, but very fast solvers might want something better.
W. Yu (3/22/15)
The YJ Chilong is one of the best YJ Cubes. The edge pieces have trenches to speed the cube up, though it is already fast compared to other cubes. Corner cutting is effortless from 5 to 30 degrees but may struggle to cut 45 degrees. Locking, corner twists and popping does not happen on factory tensions and a light cubing style, and turning is smooth, cripsy and crunchy. The cube is great till 20 seconds, and after that it does seem to be a bit slow.