I have the ultra version of this cube and it is my main for 3x3 and 3BLD. It's turning is fast and controllable with a smooth but tactile feel. I have tensioned to 7 and it is very stable. Corner cutting is very good, it has some of the best reverse cutting I've ever seen. One big problem I've had with this cube though is that I had to glue some of the edge caps back on as they would fall off easily. Also I'm glad they put a blank center cap with it for Blind. It isn't my OH main but I can do okay on it.
I would say that this is a good option for 3x3. I didn't have much trouble gluing some of the loose caps but if you don't want to deal with something like that than you should go for a different cube.
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