My son was begging me for this for weeks so finally gave in. I came across this one. It's such good value for money. The cubes move really easily. My other son wanted one too so ended up buying another one! It was slightly different to the one pictured, having neon colours instead but this wasn't a problem as they love them and we know which one is which!
The rubiks cube is extremely fast and has a great corner-cutting (you can rotate it before the right-angled sides are level). No grinding, no hooking, no creak, everything has to line up perfectly and it's extremely fluid.