I have had my ones about 2 years now. I've had absolutly no problems with them.
They are extremely light compared to the standard cranks which come on complete bikes.
I do alot of street to so my powerbites have took alot of abuse and they're still great apart from the scratches, they still run very smooth and look great.

I bought mine in silver, i know people who got them in black but the black wears off like on most other parts so id recommend silver.

I think thats all i can say about them, if you have the money i would definatly recommend these.

Costs: about $40 USD