Reliable and durable cassette technology. SRAM's cassette performance is optimized through tooth profile and shift ramp design for quick and positive index shifting.
Have you installed a cassette before? Do you have a Park FR-5G (or equivalent) to tighten down the cassette's lock ring? The Park FR-5G found here, works great and has a handy guide pin.
So far it seems to be better than my 970, which I was able to get 751 miles of use. I'm hoping this one will perform close to its cheaper counterpart.
Light weight, long lasting, looks sweet!
For the price, if you're still using 9 speed, this cassette cannot be beat. As light as the 990, but cheaper. I've had no problems with them.