I picked up a Tenkai Knights minifigure set. It's best described as Transformers meets LEGO. A 2x4 brick basically turns into a minifigure.
Pivoting the hands is different that LEGO minifigures since you have to turn the entire arm too. Most of the pieces fit snugly except for the green guy's helmet which was really loose. The accessories usually fit well except for the green guy's staff. Basically avoid getting the green guy cause he has quality issues but the other 2 I got was decent.
Overall, I think it's an interesting novelty that you should give a shot if you're curious. At $6 a figure, give one a try.