Lanlan is my favourite. My first QJ broke after a few days (one of the corners became too loose to hold the centers in place), and a lot of the tabs that hold the ball bearings in place broke. Lanlan has a really nice feel to it when all of the ball bearings are in place, and out of the box it turns faster than the QJ does. I've never had a Meffert's skewb so I don't know how good it is, but I'm really satisfied with the Lanlan.