The Gan15 is awesome! Out of the box with just some lube and it feels incredible. Light, fast, smooth, not too chunky. With Gan14 and recent flagships (WRMv10, Tornado V3 and V4) I've struggled to get the settings just right, and find myself CONSTANTLY adjusting them. With the Gan15, it just feels great out of the box, and I don't feel the need to keep experimenting with settings. Finally, GAN manufacturing quality, their UV coatings, the way their colors pop, is just unmatched by any of the other manufacturers. I glad GAN could finally dial in all of the other variables and make a cube as well balanced as the 15. I'm no professional speedcuber, but my favorite GAN was previously the 356 Maglev, and I would say the 15 has a very similar action to the 356, with a lighter, faster and more fluid feel. It is my new favorite.