This FTO has been long awaited by FTO enthusiasts for many many months. The diansheng was okay, but it just popped way too much, causing many sessions to be filled with and end in despair. This dayan FTO completely fixes that issue, with a puzzle that is literally impossible to pop. The feeling is a bit heavier and a bit more stable than the diansheng, and doesn't work as well with lube, but it makes up for it in terms of how well it performs. its corner cutting is a lot better than the diansheng, and the ball core makes for a more smooth turning experience. I think the size is a bit too big, perhaps 2-3 mm smaller would be perfect. but it is such a joy to solve on. I have done well over 2,500 solves at this point, and not only has it not come close to ever popping, but i have been able to break so many pbs with it, including a 11.26 WB3 single (at the time), 14.10 ao5, 15.12 ao12, and 16.74 ao100. all top 3 or 4 in the world! I have also gotten 2 more sub 12s since the pb single, and i just can solve on this all day long. i cant wait to see more top performing FTOs. if you are serious at all about FTO, please do not hesitate to get this.