Let me just start by saying that this is my favorite 3x3 of all time. However, there is one major problem that I encountered that made me knock off a star. After about 150 solves, the corner to core magnets begin to fall out. This is a huge issue because I felt something that was making the cube unturnable. I was able to fix this by gluing the magnets back on but it was a LOT of work. I also found that the adjustable edge magnets turn on their own when you turn fast. Other than the former issues, it is a great cube. I do recommend the flagship over the pioneer just for price and controllability.