I bought this cube purely because it looked nice, so I wasn't expecting it to turn so smoothly! Obviously this isn't a speedcube, but my speedcuber friend tried it out & told me it's pretty much the fastest you can get with a non-speedcube.
I was also worried about telling the colours apart when I ordered, but this didn't turn out to be an issue either: the blue and green sides can look similar in dim lighting (e.g., by lamplight), but as long as you use the cube during daytime or in a well-lit room you'll have no difficulty telling the colours apart.
N.B. the orange and yellow sides are neon like highlighters; the pink is also pretty bright. The cube isn't as pastel as it looks in photos.