Aluminium Ultralight Cassettes: Cheap & light, but do they last?

Aluminium hybrid cassettes, great weight savings but how to they compare to regular steel cassettes? *SIROKO CLOTHING LINK* – Additional 10% off - When looking to drop some weight from your bike, cassettes can make a big difference. However, the lightweight varieties from big brands like Shimano and SRAM can be VERY expensive. I mean a Shimano Ultegra R8000 cassette can cost upwards of £95, if you can even find one atm, and the Dura Ace cassettes… Forget about it!