This cube is surprisingly great. It's a fun twist on your normal 3x3 because it is more of a challenge. It also can go on your bag and fit in your pocket.

This little 3cm cube is amazing. It can forward cut over 45 degrees, and reverse cut one cubie, It turns fast and is relatively stable.
On a regular sized 3x3, I average sub-14, and I can get sub-20 averages on this.
It is really fun to solve on and a great cube to add to the collection.
BONUS: It is also really quiet so you can cube discretely in public without disturbing anyone.