Great price. But the steps between gears isn't very useful, in my opinion. I prefer a more linear spacing, with less space between the big gears (think Shimano's classic 11-34 tooth 9-speed cassette). Still, for the price, this does the job.
For those of us able to live without the bleeding edge of drivetrain technology, this is a very affordable, decent quality, reasonably lightweight replacement cassette. I've used this model, along with the PC-830 chain, to keep several of my older bikes running, and have no complaints.
My oldest road bike is my 21 year old workhorse. For the past ten years, the SRAM PG-850 cassette has been my 1 choice when it's time to replace a worn cassette, durable, consistently dependable, great price. Also works just as well on my older mountain bike!
Just changed two bikes from 7 sp. freewheels. For those interested the Sram cassettes & new hubs saved more than half a pound from each of my 7 sp. setups. I am hoping for less maintenance and wear at least equal to that of freewheels. My rear derailleur is a 10 sp. Campy Centaur and works fine with an 8 sp. Sram chain & DT controls. Sram cassettes are light & provide smooth shifting. An economical and well designed product.