I have been using the Ultegra cassettes for years. You can spend much more on a cassette but you won't get a better one. These work as well as anything and just last and last and last. Dura-Ace might save a gram or two and work the same, but it won't give you the long service life the Ultegra does. If you want a cassette that you can install and more or less forget about all while enjoying beautiful shifts day in and day out - this is it.
I needed to replace my 10-speed Dura-ace cassette because of worn cogs and was originally looking for a Dura-ace 10-speed cassette. Not only were they difficult to find, but the few I found were extremely expensive! I "settled" for this Ultegra cassette and I am very glad I did. Not only is it waaay less expensive, but the shifting is just as clean and crisp as my Dura-ace cassette. Even though I know there is a weight difference, I really can't feel it in any way. I have it paired with a SRAM hollow-pin chain and the combination works extremely well. I would definitely recommend this cassette.
I have the 12-23 and have probably 10,000 miles on it, rarely going 150 miles or more without a thorough cleaning. Works great! I like the 12-23 because I can stay in my big chainring for all but the toughest climbs on my usual routes, and the middle few gears are only 1 tooth difference so I have that nice stair-step up and down the gears so I'm always in a comfortable cadence in nearly all riding conditions. Never feel like I'm in a gear too low or high.
Replaced a well worn Shimano cassette and chain at the same time. Both new components work well together.
These parts were used to rebuild an old (1982) steel frame bike. Nice improvement!
When the road bike had about 16,000 miles on it, the shifting started becoming erratic. The chain would jump between gears on the rear cassette, and cleaning and carefully adjusting the rear deraileur didn't help. I replaced the cassette, the chain (which only had about 4000 miles on it), and the shifter cable, all at the same time. Now the shifting works fine, but I'll never know if it was the cassette, the chain, or the cable that fixed the problem. The cassette is well made and easy to install if you have the right cassette tool and chain whip, otherwise it would be very challenging. The next time I encounter shifting problems, I'll start by just replacing the cable before replacing the more expensive parts.
Bought this Ultegra cassette to go wih my new wheelset. I concur with claim that is better shifting. It is very smooth and precise.
Also, enjoying the new wheelset. They are lighter than my old Mavic wheels. They roll better, ride better and give me the option to go tubeless in future.
I find Ultegra cassettes bullet proof and a good value for my training bike. They are relatively inexpensive and last a long time if you take care of them. Highly recommended.
Finally gearing that is intermediate between Mountain and race. The 12-30 10 speed is perfect on my cross bike for some serious off road and touring rides. Shimano quality is also a big plus - quick shifting and durability is a given. I bought the cassette for a loaded tour and now use it to take on local MTB trails. It has made the cross bike more versatile and fun. I would recommended for adventure rides, steep road climbs and tours!