This is a solid set if you want to get into some larger (or smaller) cubes. The 3x3 is very light and papery feeling. Very fast and not super stable out of the box. Tight ing the screws a little bit and adding 5w lube helped a ton. And it's a solid performer. Very light magnets, as with the rest of the cubes here.
4x4 is pretty decent, as is the 5x5. I'm not the fastest, so I haven't had any lockups, but with some adjustments this will be solid cubes for beginners or intermediate cubers alike. One you get faster though, you might want to move on. The 2x2 is solid as well.
Overall, a good set, and even better if you concider how cheap it is.
