I got some Nano Cubics recently, I've been rolling around on em for about a week. So far I'm liking them a lot, they're fast, they maintain their speed pretty well and they're relatively quieter than your typical F4 or whatever. &&'s description of the urethane being a "harder Dragon" is pretty accurate, it's pretty similar to Dragon but performs a lot better on smooth ground like skateparks. I'm also really liking the fact that I can't fuck the end of my axles up, it's making me a lot more confident on certain slappies that I would have previously felt like they wouldn't work. Recently there have been multiple frontside slappy attempts I have made where I either didn't lean into it enough or came at the wrong angle or something and ended up not getting all the way up onto the curb, resulting in me primo sliding on the floor of the curb and spinning an axle nut off an axle causing a wheel to fall off and making me walk home to get my T tool with my broken board in my hands. It's good to know I won't do that anymore because that shit is super annoying. Also, for most other wheels I normally put several washers between the hanger and the wheel to push my wheels out more so that I can tighten the nut enough to allow the wheel to have just a hair of play while making the nut perfectly flush with the end of the axle, which is a method of mitigating damage to the end of the axle. I don't have to do that with these, which is rad, I can save my spare washers for some other setup. I can't really think of any objective downsides, although I personally like the idea of a symmetrical wheel more than an asymmetrical one because I'm sure these will cone eventually (despite what && claimed on youtube, George Powell's urethane is great but not infallible), and they will be really awkward to ride flipped. In summation, these wheels perform well while also preventing a lot of the annoying bullshit that typically comes along with contemporary, conventional wheels. 9/10 would buy again