I bought this cube from Speedcubeshop during their labor day sale for $8.95. Out of the box box, the cube was very catchy, had poor corner cutting (30 degrees). It also had an awful spring noise on two or three sides. The other reviews I've seen also mention this spring noise.
I broke the cube in for a day, then I lubricated the springs and pieces with Traxxas 50k. After breaking the cube in more, I wiped out some of the excess lube and I currently have it on Medium Tensions.
Pros
-doesn't pop or corner twist (at my tensions)
-Fast, but controllable
-High quality stickers with nice shades
-Smaller corner cutting happens with ease
Cons
-Small catches (I think it's between the corner and the center)
-Lock ups with greater than 45 degree corner cutting
-takes a lot of time to break it in
Feel
The Fangyuan has a very crunchy and satisfying feel to it while turning fast, but it's crisp and smooth while turning more slowly. To me, the turning has a slight resemblance to other shengshou puzzles because of the hard plastic. However, the mechanism is different enough that the feel is unique. When I first saw the mechanism of this puzzle, I thought it looked like the child of a yuexiao and a gans 356, but I don't have either of those puzzles, so I'm not sure how it compares. Overall the cube feels very solid and it retains the high quality seen in other shengshou puzzles.
Conclusion
The cube is definitely worth $9. There are a couple of issues with small catches, and you're not going to get 60 degree corner cutting, but the catching gets better with time, and in the context of a solve, I've never had an issue. I haven't tried every cube on the market, but I've tried quite a few, and this is one of my favourites.
Objectively, the cube probably deserves an 8/10, but I get good times with it, and I like the feel. I wouldn't be upset if I had to use this cube as my main.